CNUM

1. Global
   In this mode, the program will number structures starting from the farthest the discharge point, the number assigned to that start and down to this. The numbers will be incremented by one.
   If the next structure to be numbered receives more than a pipe entering the numbering jumps to the farthest point upstream of this structure and comes down to it. Proceeding hence to the point of discharge or until a different structure that has more than a pipe upstream.
   Thus, the flow always occurs from a greater number to less number. In the spreadsheet we can identify a change in extension when the column that tells the numbering the section has a pair of numbers whose difference is different by one.
   
   
2. By Stretch
   In this numbering mode, the program will start in the structure furthest assigned to this the number ONE, and define this branch with the initial number. Numbering follows them to the point of discharge, incrementing the frame number by one unit for each frame. When you reach the point of discharge, the numbering restarts in the second branch structures farthest from the discharge point of assigning the number ONE to this and increasing the extension number by one. In the example, Rx are the extension number and Ty are the number of the frame.
   
3. Inverted
   The numbering starts at node discharge and continues until the element farthest.
   After including this number to prefix sub sections.
   
   
4. Family
   It's similar to the numbering of the normal type, but each type of structure will have a specific number. The type is given by PartSubType property of structure.