Nested collections and sidebar menu

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Here is Shopify Official Documentation about Products.

Nested collection is composed by parent collection and child collections.

Create parent collection

1. Navigate Shopify Admin > Products > Collections.
2. Click Create Collection and input parent collection name.
3. Select Manual in Collection Type block.
4. Select collection.nested-collection in Theme templates block.
   

Create navigation to add child collections

1. Navigate Shopify Admin > Online Store > Navigation.
2. Click Add menu button and input navigation title.
3. Click Add menu item below and select parent collection we created from above step.
4. Add child menu items with collections - child collections.
   

Set menu as collection sidebar menu in theme settings

1. Navigate Shopify Admin > Online Store > Themes > Customize.
2. Switch to Theme Settings tab and click Collection Page.
3. Select create menu above in Sidebar menu setting.
4. Save settings