The data is not available for last 6 months so I was not sure if it was for last 6 months from today or any date you choose from the slicer. I have added options for both. If you meant last 6 months from today, you can use the Relative date slicer and if you meant last 6 months from a particular month from calendar, you can use the Calendar list slicer.
Changes made by me:
List item
Your model did not have a calendar so I had to add a calendar table in Power Query
I consolidated Stock and Sales values into a single consolidated table using Append and Merge in Power Query.
I created Measures for Sales and Stock such that they reflect total consolidated values irrespective of what is chosen on the Date slicers.
I created last 6 months Sales measure to reflect Sales for past 6 months dependent on the month chosen on the slicers as I was not sure if you meant a relative date or absolute date in terms of 6 months period.
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