Replace existing family parameter with parameter service shared parameter

[jkidder]

Replace existing family parameter with parameter service shared parameter 

When edited, an existing family parameter can not be converted to a shared parameter originating from the parameter service.  We need to be able to select a parameter service shared parameter while in the edit window.

Existing Revit families, or those from manufacturers that are being prepared to work with our template, frequently need family parameters converted to shared for the purpose of tagging or schedules.  This has traditionally been done by editing the existing parameter (which may be attached to multiple model elements) and then switching the source to a shared parameter.  That is not an option of the shared parameter should come for the parameter service.  The parameter service shared parameter has to be added separately, then either tied to the existing family parameter with a formula or every existing reference to the parameter being replaced needs to be changed manually.

Crossover from same post over a year ago on the ACC Ideas Forum on suggestion of @Ric_Weber   This is still just as much as an issue, especially as we try to upgrade old families to using parameters on the service.