If you need to calculate profit by subtracting cost from turnover you have a very straightforward standard chart you can create in Qlik Sense.
If you have a table of date, cost and turnover:
1. Create a line chart
2. add date as a dimension
3. add the expression Sum(turnover-cost) as a measure.Add the label profit to this expression.
Be sure to use the same casing for the fields all the time since Qlik Sense is case sensitive. For example Turnover will not be the same as turnover.