Hi wondering if anyone can help

Im inserting a block thru VBA. The block is dimensioned on several different line end points. What i want to do is change the overall dimension using text over ride. to say whatever the user had put in to there input box on a vba form the rest of the dims do not need to change as the will never change no matter the height.

So i think i need to label the overall height dimension and say that the text box.value = dim.text