expression
if you like; if you prefer; if it suits you; if you don't mind; if necessary
Polite conditional phrase used when offering an alternative or suggesting something tentatively. Often interchangeable with 何なら, but 何でしたら is slightly more formal and polite.
See also: 何なら
何でしたら、私が代わりにやりましょうか。
If you like, shall I do it instead?
何でしたら、別の日でも構いませんよ。
If you prefer, another day is fine too.