Can you submit a paper to a journal that contains a paper already accepted?
It is quite common, to publish a short letter-like paper to a high-impact journal first and then follow it up with a more detailed longer paper expanding on the first one.

However, containing the first paper as a subset is (self-)plagiarism, not original, and not acceptable. You must write the second paper independently, though some similarity of the text is okay, in particular if you state explicitly which passage has already been presented in that earlier paper and are only included for completeness.