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Prasad RuwanpathiranaPrasad Ruwanpathirana 

How to create workflow to update multiple picklist in salesforce?

I need to create a workflow field update to update multiple values in a multi select picklist. Is there any way to do this?
siddarth rajsiddarth raj
I think you can achieve this by adding more filed updates as many as you wanted to update the picklist values,(with the same crtiteria)
David ZhuDavid Zhu
Salesforce does not provide the ability to update multiple select picklist through workflow rule so far.
May use trigger as an alternative.

In the following test code, I have field DealerRegions__c multiple select picklist on object Maker__C. 

trigger UpdateMultipleSelectPickList on Maker__c(before insert,before update) 
    for(Maker__C maker :
        maker.DealerRegions__c = 'Region1;Region2';
Jonas WalkerJonas Walker
This might also be helpful.

Universal Picklists