Hi I have a table with campaigns and conversion rate. Below are the values
A1 / 25%
A2 / 12%
B1 /20%
B2/ 21%
If I wanna group A1 and A2 together and then show the average conversion rate. Also Should have the option to drill down to see the conversion rates for A1 and A2. How to do that ? The values are grouped before.