Is the field you have clicked on defined as type 'Number', or 'Text'?
There are 3 steps involved:
The field must be defined as Number
Click on the field on the layout.
Click on the number icon in the inspector
Select your formatting options
Note that this type of formatting is NOT the same as Round(nbr;4) or truncate to 4 places
Hey thanks for all your help. I did figure out the problem. I converted this database from MS, and i didnt realize it changed all fields to 'text'.
Don't worry, plenty more questions coming :)