making custom preset and trying to set kbps

Im trying to make a custom preset in encoder. Im exporting with Premiere, and was wondering how would i set the kbps using a custom preset. I have specific dimensions and kbps.  I need the format to be mp4 if its possible.

first one:

1280x720 @ 3000kbps

second one:

1920x1080 @ 4000kbps

any tips how i could make this and find out how to configure the custom presets?

-Thanks