Add manual measure with already existing data for a Line graph chart

Hi TejasShah ,

You can get your required output by adding the measure of total January prior to implementation of serial number database.  Even if you don't have the data with same granularity, you can add in a measure the January total transactions.  You can replace the yellow highlighted hard-coded number with your January total measure prior to implementation fo the serial number database. 

I attach an example pbix file below: