BBB Percentages

When doing BBB do I take 50% of my true max or do I do the same as the 5/3/1 main work? E.G. Take 90% of front squat- 315=283.5 then take 50% of training max, so 283.5=191.75.
Is this right or am I just not quite getting it?

Take it off the tm

it’s all based on your TM.

Great! Thanks a lot for the replys crj5 and Jim, I’ll do it like that then.