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Solved by Arun_Kumar_K. Go to Solution.
If you have an existing pipe or installation and if you want to connect some other eqipment or pipe later during your design stage or in future, the point where you define this is called a tie-in point. IN our P&ID you can find tie-in points under the non-engineering tab in out tool palette. However tie in is not a Autocad P&ID unique feature, it is more off a practice in industry.
Hope that helps.