Committing a version from code several revisions back

Apologies if this has been asked - I did my best searching the group's messages.  I think I can do what I want, but I don't want to hose my live repository trying to do what I think might be the procedure.  I've used branches, but only from the last revision, not from the middle.

For this discussion, let's say I have checked in tags R_1_1, R_1_2, R_2_0, R_2_1 for 1.1, 1.2, 2.0, and 2.1 releases of code.

I have to go back to 1.2 to add something.  I did this by checking out to a new folder using Tag/Branch R_1_2. I've made the additions to 1.2 and called it (in the source) 1.3.  How do I add 1.3 back into the repository after 1.2?  And how do I take the changes made to 1.2 now in 1.3 and add them into 2.2 (which is the current development not committed or tagged)?  I think the latter procedure is to update with a merge from R_1_3 into the files on my PC, but how do I get a tag (or is it branch) R_1_3 after R_1_2?

Thank you,
Bill



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