In the PowerPivot ribbon, create a new measure:

• Table name: F_Monthly_Marketing
• Measure name: Sum of Campaign_Profit
• Formula: =[Sum of Gross_Profit] - [Sum of Marketing_Costs]
• Formatting Category: Currency, 2 Decimal places, Symbol €

Create a PowerPivot query

Apply Home → Conditional Formating → Highlight cells, greater 0.

Your report should look like this.