Extract value between two Parameters

I am trying to extract parameters of columns such as size and volume; Can I extract the difference between two parameters such as the “Base Offset” and “Top Offest”, as shown in Figure? For example, it begins from level 1 to level 2. How can I write the Block node to give me 3 meters which is the difference between two levels? Capture

Hi @osamaalsehail
If you are trying to get the overall height of the column, the easiest method is to get the bounding box of the column, extract the maximum and minimum Z values and subtract the two. This will also save you having to mess around with levels. I trust that helps

ColumnHeight.dyn (12.9 KB)

columns have a parameter a BuiltInParameter INSTANCE_LENGTH_PARAM for the heigth of column
if you are an English version you can try this

for a multilingual version