If I dye my hair brown can I dye it back again?

Naturally my hair is medium ash brown. It highlights very nicely. Right now I have tons of blond highlights on top. Have for years. Now thats its fall I want to try going darker. I want it to be a medium-dark warm brown. If I dye my hair this color would it be possible for my stylist to add blonde highlights to... show more Naturally my hair is medium ash brown. It highlights very nicely. Right now I have tons of blond highlights on top. Have for years.

Now thats its fall I want to try going darker. I want it to be a medium-dark warm brown. If I dye my hair this color would it be possible for my stylist to add blonde highlights to it a few months from now if i hate being dark? or will the bleach not work over the dark base color?

please help.
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