Hi Michael: You will not be able to do it within Studio since the domain builder in Studio does not allow domains that reference a field. You will need to customize the CRM view and add domain="[('partner_ids.id', '=', partner_id)]" to the "sites" field in the CRM form.

Hello Michael Spitzer,

Step 1: First let's create new field(many2many) called "site" in contact model.


Step 2:  Let's Add new  field many2many related to site model's site field. we can make this invisible, use of this field is only for apply domain in crm model.





Step 3: Add New site field many2many in crm model with domain of field created in step2 as below



Final result : site field in crm will have option based on customer's related site.




I have attached video for more details. please have a look

Thanks & Regards,

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