Selection Toy Plugin after Boolean Operation Problem

I tried to follow the Gif by @Box regarding convert a groups to the same component with no lucky.
How to edit all same groups.

The difference with theGif is that some of the groups have been modified with by Eneroth Solid Tool. I Have a wood slat wall and used the solid tool to modify some of the slots to generate the door space, after the boolean operation It seems that each slot is individual because I cannot select them with the Selection Toy tool, but if I select them manually and convert into components, only one group is converted.

Is there a way to convert the groups resulting from a Boolean operation to components?