The phpcms column cannot be moved to other columns.

There is data, so it cannot be moved, and colleagues cannot change the model.

In fact, there is another way: (remember that if A, B, and C do not use the same model, do not use this method easily)

You first remember the A and B columns catid (column ID) and then go to the backend to delete columns A and B, then create a new sub-column under column C and name it A, B

Then go to the v9_category table and set catname equal to the data of A and B Change the catid to your original catid of columns A and B, and the data will be back.