Hi All

I am on H1 ( I-140 approved), and due to some personal reasons want to change to H4 ( EAD)
Can anyone please let me know If once after my H4 (EAD) is approved and start working with the same.
Is there a way that i can move back to my H1 in future, if yes then
- is there any time limit.
- Will my priority date retained.
- Do i need to apply for H1 through that year CAP.

Please help..

Thank you