Editdimensionproperties3

Still trying to understand VB. I'm not finding examples ofwhat I want to do.
I want to try a macro that will change the decimal places of adimension in a drawing for the shop floor.
I have my drawing units set to 3 place, which is fine most of thetime. I am attempting a macro where I would pre-select 1 or moredims. and hit a key to change the decimal places up or down 1place. I guess there would have to be 2 macros, one to increase andone to decrease.
I think I need editdimensionproperties3 to do this.
I recorded a macro in which I modified the dec. places of a dim.The macro listed 17 parameters for a dimension. I know which two Ineed to change. I would need to set "useDocPrec" to False and"precision" to add 1 to or subtract 1 from its current value,depending on which macro I run. How do I extract these twoparameters, change them and update the dim. without changing anyother parameters? Would it matter if more than one dim. ispre-selected?
So, for example, let's assign these macros to the "+" and "-" keys.
I have a number of dims. in a drawing. These dims. are using thedocument precision of 3 places.
I pre-select a number of dims. (not all) and hit the "+" key tochange the precision to 4 places. (I would prefer real-time updateon screen.) Hit the "+" key again and the precision changes to 5.You would do the same in reverse using the "-" key.
Can this be done until I hit the Escape key to de-select thosedims.?
Again, please help me with modifying only the necessary parameterswithin a dimension.
SolidworksApi macros