The Modeling Toolkit Connect tool lets you connect polygon components by inserting an edge between them.
A dotted line appears across your selection, showing you a preview of the connection.

-click) or subtract components from (
-click) your selection.
-click an empty area of your scene and select Complete Tool to complete the cut and exit the Connect tool.
The connection is baked into your mesh.

Before you bake the connection into your mesh, you can quickly adjust the Connect Options from the marking menu.
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