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So, I'm familiar with vertex groups for saving vertex selections / groups. But, is there any way of grouping faces? Vertex groups won't suffice for the obvious reason that they often select faces I didn't originally include:

Assigning vertices to the group

Selecting the vertices from the group

I am familiar with how materials act as face groups to some extent, indicating it's very possible code-wise. But, is there a way to group faces without the need for a 'material'?

As this is for a plugin, a Blender API solution is acceptable, but it must still provide a UI for adding / removing faces from these 'face groups,' even if it means the plugin adds this interface.

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Yes, Vertex Groups doesn't work.
In Blender 2.81 (or more), I use Face Maps.

enter image description here

It works like Vertex Groups but it is for face.
I am not sure if 2.81 is the oldest version that has this feature.

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    $\begingroup$ Welcome to Blender.SE. Awesomly helpful answer to start contributing! $\endgroup$ – Leander Feb 8 at 14:15
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    $\begingroup$ I'll be honest, I had no idea about this :). $\endgroup$ – Jachym Michal Feb 8 at 16:08
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    $\begingroup$ @ᴊᴀᴄʜʏᴍ ᴍɪᴄʜᴀʟ :: I believe it is a new feature that doesn't exist in 2.7x something. It is all credit to Blender developers - they listen to their users and greatly improve Blender usability recently. $\endgroup$ – cppBeginner Feb 9 at 1:39

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