% NR Reduction

None runners affect races, so I am currently using condition

Selection's Trigger Expression withdrawn_number is equal to 0

 
I sometimes use the number of none runners already announced, so only voids bet if more none runners are announced.
Just wondering if there is a way to use the reduction %, so a long priced none runner need not necessarily void the bet?
Thanks.
Mike

Not sure on the specifics, but maybe the following might work?

Create a user variable for the market reduction factor at the time of making the bet (e.g. nrpc = reduction)

Then set any voiding to take place via the condition,
Selection's Trigger Expression reduction - nrpc is greater than X
where X is how much change you're willing to tolerate

Some excellent advice from Purity, thank you!