Hi,
I have created a list with members : A,B,C. This has a property with values 1,2,3 respectively which is also a list. Now in my list with 1,2,3 members, I need to map the values A,B,C (list) so that 1=A, 2=B, 3=C as shown in screenshot below :

Is there a formula to automatically link the Property in List 123, to List ABC highlighted in yellow?
Thanks,
Ana