When a LiftPlan is open, the button "Convert to Tieup" is available. When clicked, you are prompted to save the newly created Tie-Up version under a new name. TempoWeave defaults the suggestion to the current draft name with "-TU" added to the end.
In this LiftPlan:
After clicking Convert To TieUp, the draft will now have as many treadles as necessary without pressing more than one treadle at once as shown below.
If you originally have a LiftPlan that was converted from a tie-up using Convert to Lift Plan, it's possible that the conversion back to a tie-up may have the treadles in a different order.