I created one assembly.
And I add some holes with help of assembly features,
When I mirror that assembly,
holes are not shown in mirrored assembly.
In the real world - are these holes added after the parts are assembled, or are they added before the parts are assembled?
these holes are added after the parts assembled(welded)
What I would do is make a sub-assembly with the welded parts. Then create the hole feature in the sub-assembly.
At the higher level when the weldment assembly is mirrored the hole feature would mirror correctly.
There are at least two other options if the above is not desirable:
1. Reorder the tree so the hole feature is after the mirror then edit the hole feature to add more holes practically mirroring the initial holes.
2. Mirror also the hole feature- note that "mirror components" would not mirror a feature.
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