Hi, so I was doing a parametric tiling operation where I have multiple rectangular tiles that need to be placed inside a surface with multiple holes. So, through surface collider I have managed to separate the tiles that are in the surface and the tiles that are on the boundary of the surface. When I try to split the surfaces such that I only keep the tile area that is inside the big surface tile keep combining and don’t remain separate. I used the clipper2 boolean command
attaching a screenshot without a gh file does not often help solving problems, but it’s a good starting point
in your specific case you can try grafting the Polylines A input (which I guess is the one that contains your small tiles, otherwise you can try to graft the other one)
Sorry, It’s my first time posting on this forum. I was about to attach the GH file, but wasn’t able to edit
extra.gh (23.0 KB)
I tried grafting it and it worked I think. Thank you!
no problem, welcome to the forum 
with the Rhino and Grasshopper file opened on your computer, you need to right click on the initial Surface parameter (which contains your Surface/s) and chose Internalise data
at that point save the gh file again, and reupload
you can read this for a -probably- better explanation: Help Us Help You - #10
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Thank you again. Here is the internalised File.
extra.gh (28.9 KB)
Hey again. the last file I did was kind of a test and now I tried doing the exact same thing but came up on an error
Test.gh (39.7 KB)
the error you are getting self-explains that the problem is “not all your curves are polylines”
indeed, if you check curve at index 0 it has arcs:
the easiest solution is to transform that curve into a Polyline with ToPoly like:
[also added a Boundary Surface after the ClipperBoolean because those curves were not succesfully cast as Surfaces on their own)
Test_inno.gh (42.4 KB)
one important note: going from an Arc to a Polyline means that a curve is shattered into a more or less defined array of straight segments (but Clipper is build to work with polylines only, so I guess you were fine with that from the start 
)
Test_jvs01.gh (42.9 KB)