How to make domain grants for ITEM from parent domain to subdomain?

Summary:

We have a requirement that users will update Item information from the subdomain, and we have designed a screenset with mass update functionality.

The items are maintained at the parent domain level; hence, the mass update fails every time.

How do I make domain grants to accommodate the above requirement?

I tried to make a domain grant C.ITEM table set but it didn't work.

If you have come across such a requirement, please guide me with the resolution.

Thanks in advance!

Content (please ensure you mask any confidential information):

Domain Grant

Version (include the version you are using, if applicable):