Pablo Dobarro on Twitter: "Multires Subdivide Simple and Linear modes for sculpting hard surface objects are now in Blender 2.90. Today I also coded the Delete Lower Subdivisions operator. After merging that,
Subdivision Surface Modifier — Blender Manual
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Subdivision behaviour is different than in any other software causing compatibility issues - User Feedback - Blender Developer Talk
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Subdivide — Blender Manual
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How to Subdivide in Blender?
How to select the opposite face in Blender - Quora
How to SUBDIVIDE a 3d model in Blender }
Subdivision behaviour is different than in any other software causing compatibility issues - #15 by postrowski5 - User Feedback - Blender Developer Talk