@gashok35 

I recommend implementing the following NowLearning for a fulfillment with Catalog-driven orchestration (SOM/OMT).

Sub-Flow should be set up as an orchestration for each category of Specification set up in the catalog.

・Sales and Order Management (SOM) Implementation Essentials
https://nowlearning.servicenow.com/lxp/en/customer-service-management/sales-and-order-management-som...

・Order Management Fundamentals

https://nowlearning.servicenow.com/lxp/en/telecommunications-service-management/order-management-fun...

An example of dynamic orchestration is "Staggered Decomposition" in ServiceNow, which allows for dynamic decomposition in the fulfillment process. This Staggered Decomposition is also explained in detail in NowLearning (Order Management Fundamentals).