I got this from help.sap.com . But with use of Import manger we can import the mask names.
Non-Main Table Imports
The MDM Import Manager can be used to import not only to the main table but also to the subtables of an MDM repository. However, there are several differences when importing to a subtable with respect to which fields require or permit optional value mapping and which fields must be used for record matching.
For more information, see When Value Mapping Is Required, Value Mapping and Lookup Table Display Fields, and Record Matching and Lookup Table Display Fields.
You cannot import to the Masks or Named Searches tables. is this means we cannot import records into a mask ?
Please let me know.