Manage Characteristic Catalog

Hi Experts

The App for Manage Characteristic Catalog for Product Allocation allows adding attributes in the catalog of fields that can be used. I would appreciate inputs from experts on the following:

• When the field is added to the catalog, there is a field for Value Existing Check type. What is the purpose of the field ?
• What is the use of Characteristic Value groups and how are they used ?
• If there are custom fields in the customer master and / or sales documents, would they be available to be used or do we need to have any other steps to use custom fields in these objects ?

Appreciate your responses

Regards

Rohit Zalani