If this is the description???... MainFolder\SomeFolder\01.png ==> MainFolder\Folder 1\ch01\01.png MainFolder\NextFolder\01.png ===> MainFolder\Folder 2\ch01\01.png MainFolder\SubFolder3\01.png ===> MainFolder\Folder 3\ch01\01.png
This can be the settings... First to put a checkmark in the menu "Renaming Options, Advanced Options, Allow using '\' in Renaming Criteria. Filters(12) should only put a checkmark inside "Folders", then to click your MainFolder inside the folder-tree. The Name(2) should be "Remove" and also have Folder \ch01 underneath the "Remove". Then Numbering(10) should have Mode==Insert, at==7, and also recommend Pad==2.