How to get Celtic B & Rangers B in 2nd division on FM181) Download the Celtic B & Rangers B.fmf file.
2) Drag the file into your "Editor Data" folder. located at \Documents\Sports Interactive\Football Manager 2018\editor data.
If this folder doesn't exist, create it.
3) Open Football Manager 2018 and start a new career, In the top right of the screen, under "Database", make sure "Celtic B & Rangers B" is selected.