ME55 PR Release

Dear All,

1) Our client want to release all PR's in ME55 tcode in one click, without clicking each line item.

Is it possbile in ME55 as we do in ME54N by selecting all line items and clicking release flag?

2) How to change existing Item level PR release strategy to Header level?

If its Header level,where Release strategy tab appears (as we see in PO)?

Please advice

Regards