Calculation with Field that Reset to 0
I'm trying to keep a tally of resources (Field: Total Value) and I want to be able to use a blank field with user inputted number data to make the total value go up and down. Then I want the blank field to reset to blank or 0 for the next time it's used.
Am currently trying to make this happen using variables but no luck so far. Any advice would be greatly appreciated.
Thanks in advance!