Add properties to line item subset

Description of the enhancement required:
Add List Properties for Line items subset and a full menu (like ordinary Lists have). Currently there is only one “Description” property available

An example of the enhancement:
Adding properties section for a line item subset would allow the business to store non numeric information in a LIS. Using those properties, it would be easy for model builder to refer to properties of LIS rather than writing a cumbersome formula.

A story for why you want the enhancement, (how would it help your business process):
Helps in creating summary modules and applying filters on the summary modules.