Answer: Rather than cut them back and significantly delay them, I suggest you pot them up into larger containers. Remove the lower set or two of leaves and set them deep in a gallon size container, burying the lower stem. The plant will root all along buried portions of the stem.
You can do a similar thing when you set the plant out in the garden. Simply lay it on its side in a shallow trench. Turn the end of the stem up toward the sky and bury the stem.
Good luck with your tomatoes!
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