Move labor resouce from one activity to another - resource assignment reallocation

in P6 R8.3.6,  I want to move various labour resources on various activities to other existing activities.   Some of the resources have been wrongly allocated, others need to move to a different time period. 

I want to move the resources with the associated Resource Assignment UDF's.

Is there a way that I can drop and drag the resource and assigned codes from one activity to another in Resource Assignment Tab (similar to task drop and drag in Activities table)? 

Or can I do it some other way - drop and drag/ copy &  paste?

Plan B is to reassign using excel export/import  (create and delete) - or is this the only way to do it without SQL access?

Thanks