Relationship between different CS Teams!

Hi, guys!

I work at a software reseller/ consulting firm, reselling cybersec software from companies like IBM, Forcepoint, OneTrust, etc. The thing is, those "supplier" companies also have their own CS teams. I'm wondering, whats the type of relationship/ responsabilities between:

EXAMPLE

IBM CS Team (supplier) -> LEADCOMM CS Team (my own) -> Client.

Do you have any tips?

Thanks,
Lari.