Assingment in Tuple

Hi,

Here is my scenario,

Refer Material Data model, Location data tuple. I would like to default 3 PLant Values (rows) whenever new Material records is created in Data Manager. the Plant values are fixed like 1, 2 and 3. Other values like Plant related alues will be maintained by respective Users.

HOw can we achieve this? Will assingment help?

Cheers,

RC