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Sandile matheSandile mathe 

Multipicklist dependencies based on Parent Multi Picklist

functionality where end user can choose multiple field values from multi select picklist and based on that master picklist user should be able to select a multiple child values from the another multi select picklist.
Khan AnasKhan Anas (Salesforce Developers) 
Hi Sandile,

Greetings to you!

According to Salesforce doc (http://Dependent Picklist Considerations):
Multi-select picklists can be dependent picklists but not controlling fields. So, It can not control other fields' value.

There's an idea which is active on the success community with a similar discussion for which you can upvote so that it gets available in the future.

https://success.salesforce.com/ideaview?id=08730000000BqrfAAC

Please refer to the below link which might help you further with the above requirement.

https://salesforce.stackexchange.com/questions/126742/creating-dependency-in-multi-picklist

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas