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Selective Pre-Translation

Hello! Using Trados 2017.

I've found myself using custom MyMemory keys for a certain kind of work.

The problem is that there are relative large files; in each, there are a large number of "narrative" TUs for which MyMemory is useful, but also a large number of "label" TUs for which MyMemory is useless. Unfortunately, I'm charged for the whole file, which is making the MM bill ridiculous.

Is there a setting that will allow me to hit a key when I want a MM pretranslation of a TU - and NOT hit a key when I DON'T want an MM pretranslation of a TU? Or something similar?

Thanks in advance!