Email clients like Thunderbird aren't really designed to put stuff back on the mailserver, which is what GMail is from Thunderbird's point of view. The easiest way to do what you want to do is just to forward all of the emails you want to keep to your GMail account.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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