How to setup a 3rd party visibility field?

In a request type, add a new header called "3rd party visibility"
create a field called "3rd party visibility"
give it a token name of "3PV"
within the field, set the security tab to only allow the "PM" group to see this field
add a custom token to the "user tab" in each relevant request, called [REQD.VP.3PV]
create a validation called "3rd party visibility" and add all relevant 3rd parties.
To use it, select a value from the drop down menu in the request type. Only the "PM" group will be able to do this.