what is the link between main negotion number with negotion number whic has multiple rounds 2 or 3

oracle fusion 11.13.23.10.0

for e.g in my system i have negotition number with this

RFX-CSC-230022 this is main one

RFX-CSC-230022-2 this is 2nd round

RFX-CSC-230022-3 this is 3rd round with final awarded amount

i want to make link with the "RFX-CSC-230022-3" number and with its parent number "RFX-CSC-230022"