Sort lines, then tag, then unsort

I would like to sort lines in a text document and then tag them, and then revert the file to its original order.

First of all, is there a way to tag a line, so that lines with a given tag can be quickly referred to, but the tag is not in the actual text?

Secondly, I noticed with my sort command ":sort \^[A-Z].*[^\.]$\ r" (sort all lines beginning with a capital letter and not ending in a period) it sends the matches in alphabetical order to the bottom of the file. Is there a way to specify a second-order sort by which all the matches are sub-sorted, rather than the default alphabetical? And, is there a way to send them to the top of the document rather than the bottom?

Thanks very much,

Julius

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