Is Multi-Leveled blocks with multi-leveled visibility states even posible. This block has several (same) blocks within it that need to be counted for BOM. These blocks are added or removed as the selection on inputs change from the atached parameter. How would this work...? I also need to be able to edit the other attributes within these lower level blocks without exploding or going into the BEditer. The different leveled Visibility states would be like a file directory tree. Top layer would have 4 options while each of the four options would have several options of their own with possibly more options within those options. Is any of this possible. Please advise, Thanks..