Move employment based GC priority to family based GC case?

USA Green Card
1

I have an approved I-140 for an EB2 case in the ‘employment based GC’ with September 2014 priority date.
Can I transfer this priority date to a family-based case, if my relative is ready to sponsor me?

2

No. Porting is not possible from employment based i-140 to family based case.

If your relative sponsors you now, you will get a new priority date for your family based case.

At this time, both are highly back-logged.