There is not, as far as I'm aware, as there is no way to select multiple commands in the command list.
What does exist, is a way to change the name of a category, which also works on the "[No Category]" header.
So, if you have all your other commands grouped already, you can right click the header(if grouping by command is on) and select "Rename Category..." from the context menu to assign commands to either a new or an existing category.