Problem Seperating model into two seperate parts

This is a third party model I’m using
I’m trying to split this selected portion into two separate parts.
However whenever I follow any instructions to bisect I only end up being able to cut some material from a single line on one side of the object

hey @Hazmater ! first, you should delete the center edges, then select your two edges loop, and create a “Bridge edges loop”, then “loop cut and slide” in the middle, separate them if you want in selecting the middle loop and pressing “v” touch.

Ah ok Thank You