Please see the following link:
What I am trying to do is automatically check/uncheck the relevant 'select all' checkboxes depending on whether the siblings have all been checked.
For example, if I check Sub1->1...3, then the Select all under Sub1 should be ticked as well.
If I then untick any of them, this should automatically untick the 'select all' box.
If I think tick every single checkbox, this should tick Main->select all (as everything has been ticked) and vice versa.
Hope that makes sense.
Please can anyone help me with this?
Many Thanks for any help!