Dynamic X axis in line chart

Hi All,
I'm making a line chart in Webi in which different lines represent different products. On the Y axis I have a measure (no problems here) and on the X axis I have months. Naturally, different products enter the chart at different points along the X axis because they didn't all enter the portfolio at the same time as you can see in the print screen. My problem is though, that I want the start point for all of the lines in the chart to be at the X-Y intersect, not the month that they actually started. The values for the X axis should then be 1 - 24 or something similar to cover a 2 year period. Newer products would then have a line that stopped at some point in the middle of the chart, rather than one that started in the middle.
I've been trying to create a new variable where min([Month]) is equal to 1 and then each month after that would be +1, but I'm not having any luck.
Thanks in advance for any suggestions.

Hi Jeremy,
Thanks for your tip. I've created a new variable to calculate the months between the very first date and the product specific dates, and then subtracted the difference so that all products start at the same date in the new variable. But it still leaves me with the same problem as I had with the count variable earlier. When I place the new variable on the chart it returns a multivalue error. Any idea on how I could get around this? In table format it looks like this:
Table 1 with original month and new variable
Table 2 with only new variable
Table 3 desired outcome
Product
Month
*Adjusted Month
Rate
Product
*Adjusted Month
Rate
Product
*Adjusted Month
Rate
Product 1
201205
201203
Product 1
#MULTIVALUE
1.61%
Product 1
201203
Product 1
201206
201204
0.05%
Product 2
#MULTIVALUE
2.12%
Product 1
201204
0.05%
Product 1
201207
201205
0.07%
Product 1
201205
0.07%
Product 1
201208
201206
0.39%
Product 1
201206
0.39%
Product 1
201209
201207
0.65%
Product 1
201207
0.65%
Product 1
201210
201208
0.94%
Product 1
201208
0.94%
Product 1
201211
201209
1.18%
Product 1
201209
1.18%
Product 1
201212
201210
1.16%
Product 1
201210
1.16%
Product 1
201301
201211
1.61%
Product 1
201211
1.61%
Product 2
201205
201203
Product 2
201203
Product 2
201206
201204
0.02%
Product 2
201204
0.02%
Product 2
201207
201205
0.29%
Product 2
201205
0.29%
Product 2
201208
201206
0.74%
Product 2
201206
0.74%
Product 2
201209
201207
0.95%
Product 2
201207
0.95%
Product 2
201210
201208
1.37%
Product 2
201208
1.37%
Product 2
201211
201209
1.77%
Product 2
201209
1.77%
Product 2
201212
201210
2.12%
Product 2
201210
2.12%

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