> For the complete documentation index, see [llms.txt](https://kenna-ai.gitbook.io/kenna-ai-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kenna-ai.gitbook.io/kenna-ai-docs/tools/line-builder.md).

# Line Builder

Expands a product line by combining design assets with product bodies — upload multiple design references and multiple product templates to generate variations.

#### When to use it

Reach for Line Builder when you want to produce a whole range at once — one design across several product silhouettes, or several designs on one product. It batches design assets against product bodies, which makes it the fastest way to expand a product line.

#### How to use it

1\. Upload up to 4 design assets (patterns, graphics, color references).

2\. Upload up to 4 product bodies (blank templates or existing products).

3\. Describe how the designs should be applied. Choose a Mode — Apply Assets & Colors, or Style Transfer — and select the Product Category (e.g. Footwear, Outerwear, Handbags & Accessories) so results match the product type.

4\. Click Generate. Cost: 5 credits per product body.

#### Credits

Costs 5 credits per product body. A run across several bodies is billed per body.

#### Tips

This is a batch production tool — use it when you need to see one design across multiple product silhouettes, or multiple designs on one product. Use Remove Branding to create blank product bodies first.