How do I add a Balance Dimension to be Valid in a Payroll Balance Definition?

Summary:

I would like to leverage some of the time-based balance dimensions, but only "Run" balance dimensions are delivered as valid in our system. For example, how do you update Relationship Tax Unit Year To Date so that it is Valid? I haven't been able to see a way to edit the Dimension record in the Balance, to change this value, and haven't found anything in docs.oracle.com or in the Cloud Customer Connect forums.

Content (required):

What are the steps to change a Balance Dimension in a Balance Definition so that it is calculated during payroll runs to be used in reporting?