if i did a run, but got a better time, can i submit another run to that catergory

Yea you can submit multiple runs

Yeah, course. It will only show your best, though, unless you enable obsoleted runs

Yes you absolutely can but generally for me I wait until one run has been verified before I submit another one, mostly to make things easier for the mods but also to push myself to get the best time I can before I'm "allowed" to submit a new run

@DigiTamerRiley that might be not true i uploaded 2 runs almost in the same day and few days later both runs were done w/ their verification of course it follows the order that I uploaded and perhaps if you submit multiple runs in one time, it may take much longer time for verification than single runs