In the code less bot builder, if there are multiple buttons all going to the same block, it is not possible to disconnect a single edge in the middle because clicking on the Scissor icon only removes the lowest edge. This is because all the connecting lines overlap. If you could provide a tiny gap between these lines so they don't overlap, it might be easier to select a single line and disconnect that particular edge. For example, once connected, you cannot disconnect the edge for Option 2 below.
Clicking on the scissor always disconnects the lowest edge. You cannot disconnect an edge in the middle.
A workaround is to move the corresponding option all the way down in the list, and then use the Scissor icon, and then rearrange the list again. But a simpler solution would be nicer.