I am using a custom button to create DDPs with this URL:
/apex/loop__looplus?eid={!Opportunity.Id}&accountId={!Opportunity.AccountId}&sessionId={!$Api.Session_ID}&filter={!Opportunity.Type}
The filter refers to the Opportunity Type picklist field. Can I convert this filter so that it works with more than 1 value? Currently, I put 1 value into the Filter field on the DDP (see screenshot) and this works. However, I would like this custom button to work with 2 of the values of the Opportunity Type field. Example: Type = Existing Business OR Value2