Sorry for the late reply.
If you are OK to use parameter it's not difficult.
Create two parameters
Then put "Current Value" as"Please Select Owner 1".
Same steps for "Select 2"
Create calculated fields
[Selected Owner 1]
if [Select Company 1]= [Customer Name] then [Sales]end
[Selected Owner 2]
if [Select Company 2]= [Customer Name]then [Sales]end
Put Label thru Parameter.
Test Workbook2 SM_10.0.twbx 1.2 MB