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Currently I have a 2048-bit PGP key. Suppose I create a new 4096-bit key. Can I add that old key as a subkey of this new one?

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  • $\begingroup$ If you are interested in how to do it and have further questions, you could ask on Super User. $\endgroup$ – otus Jun 17 '16 at 9:39
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Yes, PGP allows different-sized subkeys and subkeys are not derived of the main key, so it is possible to have the earlier key be a subkey of the new one.

How to do it is off topic here, but this should get you started if you use GnuPG.

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