Please read the FAQ’s in the individual forums before posting, as this topic is discussed a lot.
I think you might get “Variables are not compatible” error when you try to insert or drag a dimension to the block.
Follow this link to come to a resolution.
https://bobj-board.org/t/15226/2
If this is not what you are after then provide more details …?
BO_Chief 
(BOB member since 2004-06-06)