Indeterminate Bush Pruning (Rouge De Marmande)

[Aussiemark]

I am growing Rouge De Marmande and Burke's Italian (Austrian branded name) this year. I believed that all the tomatoes I was growing are indeterminate vine plants. I now discover, after some head scratching and googling, that these two are considered indeterminate bush tomatoes.

I didn't know this when I went to prune them, and they sure looked like bush tomatoes, multiple strong stems at the base and the plants were bushy and upright. I cut the plants back to one or two main stems and tied them up (like I would a normal vine type), but I knew something was not right.

So how do people prune/train these? With my vines I keep them to one main stem early on, to about 12-16 inches off the ground, and then I let them grow as they like and just keep tying up, with a little trimming here and there. I expect this may not be the right treatment for these Indeterminate Bush types?

Any insight would be helpful.

Thanks

Mark