I am new to among you! I have a problem. I am working on polygon modeling in Maya 2010. I am not using Split Polygon tool. I trying many variation for use it. But I can't
I want to split in red circle on this picture.

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and file url : https://hotfile.com/dl/121473219/9e12...eling.rar.html
I need help immediately!
Thanks for help nowly,
Good Night...