Hi
If a husband wants can he cancel the H4 or EAD or AP or 485 process for the wife that he sponsored when they are still in the marriage ?
-------If still married he cant cancel your Pending I-485.your signature is needed on the letter if he want to send it to USCIS. Don't sign any paper without reading the contents.
EAD, AP are based on Pending I-485 and he cant cancel them. You can file your EAD ,AP directly if you have I-485 filing receipt or Copy of your I-485 filing receipt.
Is that an easy process or tough process or cannot be done ?
--Not easy. When divorce is finalized then you will not be eligible for I-485 approval or for EAD extension or AP.