I am creating small routing assembly. I would like to add fastener is valve flange.
How can i do it? Please help me..
your question is unclear . can explain more or attach a screen shot or attach your file .
Any par with axis , use to guide the routing path.
If both flanges have proper dimensions you can simply use "drag&drop" from toolbox to create one set (bolt+nut), than just copy them with mates. Using smart fasteners is not recommended, especially for small pipes. F.e for DN25 (OD 33,7) you can get M30 bolt inside of pipe
If graphic representetion is not needed you can prepare some "dummy connection set":
As you can see i prepared libary for different PN and DN.
How it looks on drawing:
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