You indeed have to partition the drive into two physical volumes, one for HFS+ (Time Machine requires HFS+) and then a second one for the container that has the APFS volumes. You do this with Disk Utility as you'd expect - you can't store an HFS+ volume in an APFS container, but they can exist side-by-side without trouble.
My general advice, as you know, is to
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--Dave Nanian
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