One Grant Multiple Sponsors

Hi:

There is a new scenario at our client. There are three different sponsors who wants to sponsor a grant collectively, each of them contributing part of it. I know there is 1:1 relationship in Grant master of grant to sponsor but i would still like to know if there is any best practice for this scenario in GM-GTE.

Moreover there are some assets which are sponsored by multiple grants, i know we can use sub asset functionality to treat one asset sponsorship by multiple grants but is there any standard practice in SAP for it ?

Regards