Adding sounds to Urban Beats - is it possible?

Gidday

The kit I’m using in Urban Beats is cool, but ideally I want to duplicate one of the kicks and truncate it, as the bass in it rings on too long for some of the kick hits - that way I can have the original kick for the long notes, and the short one for more space. Is it possible to do this? If not, is there a way to make the kit samples only play for as long as the length of notes in the Key Editor?

Thanks for your time and help.