so basically.. 1000.00 would display as 1,000.00
You can use Variable Search Replace as in this example.
format number (78)
A1: Variable Set
Name: %num
To: 1000000
Do Maths: Off
Append: Off
A2: Variable Search Replace
Variable: %num
Search: (\d)(?=(\d{3})+$)
Ignore Case: Off
Multi-Line: Off
One Match Only: Off
Replace Matches: On
Replace With: $1,
A3: Flash
Text: %num
Long: Off
Make sure there no spaces in the search parameter. Verify that you checked Replace Matches and that the replace parameter is $1,
I know this works here, there is no reason why it shouldn't work on your device.