Edit the "Webbing" part in the assembly and select one of the faces as a plane to start your sketch, select the outline of each hole and convert entities and use the cut extrude feature to cut the holes in the Webbing.
You can also do what Mark Greenwell mentioned.......
Thank you both for the replies.
I am aware of both methods, and was hoping for something a bit more automated.
In the assembly, that are actually a number of similar parts that get inserted; some have holes and some don't.
If this were a one off job, I would have cut the holes already and not even posted, but we have been contracted to do many of these part over the next 3 years so cutting each hole manually (or even cutting one a propagating it in the linear pattern) becomes less desirable.
Is there a different approach that you can think of that would not have the mat filling the holes in the part?
Is there a way to mate the part to a plane, then extrude a mat around each part?
It would be nice to see a sample of what you need to do, you mentioned there are similar components. There are other questions in my mind, but not sure if they're relevant..
Here is a snippet of the final assembly. Only the holes called out are through the mat. This assembly has five unique parts.
Each mat can have dozens of parts after the linear pattern (depending on the size and shape) and each part could have 1 or more through holes. Hopefully this clarifies why I want to automate this. Again, if this were a one off job, I wouldn't have even posted, but saving 5-10 minutes by automating the process, will pay off in the end. Not only that, the fewer things I have to do manually, the fewer thing I have to worry about not doing right.