Modify concrete column

Question

I am using Modify Structural Attributes to change the length of a concrete column. When I apply the new length value, I get the message "1 element changed" but the length has not been changed... Any ideas?

Pedro Serra · Accepted Answer

Chris, 
In SS5: 
You can select by attributes to select all the elements you want at once, 
In architectural design choose modify form and use that tool 
I don’t know any other way, nor about ss6.

Steve Cocchi · Answer

I'm not exactly sure how you're accessing the Length property - those under StructuralQuantities are intended as resulting component values - but it would be better to use the Modify Member End tool, or simply grab the Edit Handle and stretch as needed.

Steve Cocchi · Answer

I don't recall the Quantity properties ever being editable, which is what threw me off... 
 
That said, there is a simple old-school way of modifying multiple column lengths at once - Fence Stretch.