Multi-select field choice restrictions

Multi-select field choice restrictions

Hello!

I have the following question: I have a Multi-Select field in Zoho CRM and I would like to restrict the options the user choses from based on what he chose as a first value. For example:

Let's say my Multi-select field  contains the following values: A, B, C, D, E, F
- If the user choses A, he can only select B or C or both B & C
- If the user choses D, he can only select E or F or both E & F

Is it possible to do so? I tried using layout rules, but I could not choose the Multi-select field as the primary field :/

Thanks in advance!