Save part from file.txt to file1.txt ?

I haven't found it in help yet because I'm probably not searching correctly.

I want save the yanked text from one large file and save it to another
file. I can do this manually with no problem but how to do it
automated has escaped me so far.

I want to generate file1.txt, file2.txt, file3.txt from file.txt with a mapping.

I open file.txt yank "a50Y another "b50Y another "c50Y

:tabnew 3 times paste a, b, c into the 3 files.

Now I have 4 files open and 3 not saved. How to tell Vim to save and
name them file1.txt file2.txt file3.txt

Will someone point me to the correct help file please.

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