Polymorphic Line Items

Q: What is a Claude Code skill and how does the Polymorphic Line Items skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Polymorphic Line Items is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Sales category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Sales · Sub-category: crm-systems · Last updated: 2026-06-13

Design and implement polymorphic line items in a sales/quoting system — single parent (Quotation/Invoice) with mixed child item types (Product vs Service with different field shapes). Use when a quotation/invoice/order can have line items of more than one domain type (e.g. physical products + consultancy services), or when item fields don't fit a flat single-table model. Covers Option A (separate tables + discriminator + dual FK), STI trade-offs, snapshot pricing for accounting immutability, and Prisma enum/JSON write casts. Pairs with `crm-data-model` and `backend-rbac-audit-log`.

About this skill (catalog notes)

Polymorphic Line Items includes pricing or quota commentary; 21 code blocks for direct copy-paste. At roughly 5,052 words the SKILL.md is on the longer end of the catalog distribution.

Original author: freedomw1987
Indexed lastmod: 2026-06-13
Catalog position: Sales · crm-systems
Indexed related skills: 10

How Polymorphic Line Items fits the catalog

Polymorphic Line Items sits in the Sales category under the crm-systems sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

What this skill does

Polymorphic Line Items is a community-contributed Claude Code skill in the crm-systems sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/polymorphic-line-items/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when a quotation/invoice/order can have line items of more than one domain type (e.g.

Who uses this skill

The Polymorphic Line Items Claude Code skill is built for sales development reps, account executives, revenue operations teams, and customer success managers. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/polymorphic-line-items
curl -L https://claudskills.com/skills/polymorphic-line-items/SKILL.md \
  -o ~/.claude/skills/polymorphic-line-items/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/polymorphic-line-items/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/polymorphic-line-items/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\polymorphic-line-items\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Polymorphic Line Items Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/polymorphic-line-items/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Polymorphic Line Items skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Polymorphic Line Items skill?

Use Polymorphic Line Items when your Claude Code task falls under the Sales category — specifically in the crm systems area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Polymorphic Line Items" or describe the task and let Claude pick). Browse related skills at /category/sales/.

What is a Claude Code skill and how does the Polymorphic Line Items skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Polymorphic Line Items is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Sales category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

freedomw1987. (2026). Polymorphic Line Items [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/polymorphic-line-items/

BibTeX

@misc{polymorphic-line-items-2026,
  author    = {freedomw1987},
  title     = {Polymorphic Line Items [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/polymorphic-line-items/}
}

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Browse all Sales skills → Top 100 skills

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