who can help me make a 6s into a 3s

[MetalMan]

What brand is the pack? Some companies put some super-strong double-sided tape between cells that makes the bond nearly impossible to break without either tearing the Lipo outer material or messing up the cells. If it has a PCB, that could also complicate things.
If this battery isn't built either of these ways, then turning it into 2x 3s should be fairly straightforward.