Masks 
You use this function to partition a single product repository into a number of custom subset repositories without duplicating product records. You can use masks as an alternative to Named Searches.
You can set up masks for the following user groups:
Employee (users who are assigned the role Employee)
Catalog access of the corresponding users is restricted to items in the category Office material.
Manager (users who are assigned the role Manager)
Catalog access of the corresponding users is unrestricted or includes all categories to which users have procurement authorization.
Prerequisites
You have been assigned the role Catalog Manager or Administrator
For user-specific catalog access, masks must be created as part of the system configuration.
For more information about masks, see SAP Solution Manager under 
<project name> 
Scenarios SAP SRM <release> Catalog Content Management Business
Processes Managing Product Content in the SRM-MDM Catalog Define Masks and Named Searches 
Activities
To define masks in the MDM Data Manager, you create an empty mask with a name and language details, and add records to it.
Note
On the search user interface (UI) of the SRM-MDM Catalog, the mask parameter is independent of the user parameter.
You can create multiple masks and assign each to a different user.
For more information, see SAP Service Marketplace at http://service.sap.com/installmdm
Note
Masks are static objects in contrast to named searches that are dynamic. When you import catalog items and the import replaces existing destination records with incoming source records you must update any masks that contain the replaced records.