You can use the orderByClause parameter to sequence the Products on the Catalog page. You can add a new field in the Product2 object (for example: as Category Rank) and set the orderByClause in this manner: productOrderByClause=Category_Rank__C NULLS LAST, Name while configuring a formula to launch the Product Catalog.

By default, the product list shown on the Catalog page is sorted by Product Name.

To sequence the Products on the Catalog page

  1. Create a new custom field on Product2 object. For example: Category Rank.
  2. From the Product Detail screen, assign the appropriate numeric value for this field.
  3. Use the following formula to launch the ngCart.
IF ( LEN( Apttus_QPConfig__PriceListId__c ) > 0 ,HYPERLINK("/apex/Apttus_QPConfig__ProposalConfiguration?id=" &Id&"&flow=ngFlow&productOrderByClause=Category_Rank__c NULLS LAST, Name" ,IMAGE("/resource/Apttus_QPConfig__Button_Configure", "Configure Products"),"_self"), NULL)

On the Catalog page, Products are displayed based on the sort order defined in the custom field.