Label month serially from selected periods in DAX

[Dataholic]

Hello all,

I am working with a data set that contains the month in which the customers subscribed for services, and their monthly payment subsequently.

The goal is to try and determine the number of customers that dropped off or who didn't make payments on a subsequent basis. I have been able to determine the count of customers on a monthly basis who dropped off.

The data looks like this. I have put it in excel to simplify things 

		Monthly Payments
Month subscribed		Jan-21	Feb-21	Mar-21	Apr-21	May-21	Jun-21	Jul-21	Aug-21	Sep-21	Oct-21	Nov-21	Dec-21	Jan-22	Feb-22	Mar-22	Apr-22
Jan-21		900	867	834	801	768	735	702	669	636	603	570	537	504	471	438
Feb-21			800	767	734	701	668	635	602	569	536	503	470	437	404	371
Mar-21				940	907	874	841	808	775	742	709	676	643	610	577	544
Apr-21					939	906	873	840	807	774	741	708	675	642	609	576
May-21						310	277	244	211	178	145	112	79	46	13	0
Jun-21							893	860	827	794	761	728	695	662	629	596
Jul-21								493	460	427	394	361	328	295	262	229
Aug-21									920	887	854	821	788	755	722	689
Sep-21										120	87	54	21	0	0	0
Oct-21											222	189	156	123	90	57
Nov-21												294	261	228	195	162
Dec-21													748	715	682	649

What I am trying to get at is to normalize the monthly progression of monthly payments relative to the subscription month to look like this;

		Monthly Payments
Month subscribed		Month 1	Month 2	Month 3	Month 4	Month 5	Month 6	Month 7	Month 8	Month 9	Month 10	Month 11	Month 12	Month 13	Month 14	Month 15	Month 16
Jan-21		900	867	834	801	768	735	702	669	636	603	570	537	504	471	438
Feb-21		800	767	734	701	668	635	602	569	536	503	470	437	404	371
Mar-21		940	907	874	841	808	775	742	709	676	643	610	577	544
Apr-21		939	906	873	840	807	774	741	708	675	642	609	576
May-21		310	277	244	211	178	145	112	79	46	13	0
Jun-21		893	860	827	794	761	728	695	662	629	596
Jul-21		493	460	427	394	361	328	295	262	229
Aug-21		920	887	854	821	788	755	722	689
Sep-21		120	87	54	21	0	0	0
Oct-21		222	189	156	123	90	57
Nov-21		294	261	228	195	162
Dec-21		748	715	682	649

Please bear in mind that to normalize this, I have to write a DAX to recognize the subscription month as "Month 1" and the subsequent months as "Month 2, Month 3, ..."

Please help with this @amitchandak @v-yiruan-msft @tamerj1 

[Dataholic]

I was actually on my way to solving the months labelling. This solves it perfectly.

Thank you

[amitchandak · Accepted solution]

@Dataholic , Seems like this one to me

Customer Retention Part 3: Period Of Stay – Cohort Analysis: https://community.powerbi.com/t5/Community-Blog/Customer-Retention-Part-3-Period-Of-Stay-Cohort-Anal...