The Attribute Manager should bring across the layer combos and all their settings.
But you may need to make sure that the individual layers are 'Overwritten' and not 'Appended' so they keep their original index numbers.
I think the layer combos use the index numbers rather than the layer name and if you append layers they will get different index numbers assigned to them and the combos won't turn the correct layers on/off.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11