If you have an industrial park with a common undergound loop, or many floors in a building with piping out to a pump house, or any need to reuse supply piping, then the Open Append option in HydraCALC is for you. It will add the file you select to the job you currently have open.
Build some supply piping to use on multiple calcs (below) and save it as usual.
Then you can simply append it to the bottom of your current job by postioning the cursor in the line where you want the supply piping and picking Open Append off the File pull down menu. Then, select the file containing the piping you want to append.
The piping will be inserted starting at the cursor location and continuing down for as many lines as necessary.
The H-Factor 
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