2. Solved…
Is it possible to do so that all sub-categories are automatically included in the schortcode?
[wpdm_category id="slug,slug..." cols="1" toolbar=0 item_per_page=10 template="5d00042232834"]
If I select CAT, it automatically displays SUB1, SUB2, SUB11 etc.
CAT
-SUB1
–SUB11
-SUB2
In case 1, I do not know how to do it.