yes, in the trigger section of the discount rule add another trigger:
AND
number of items with a specific column value:
If the total Number Of items where 'discount' has a value of '1' is '>' a value of '0'
for the calculation use:
Based on items with a specific value:
Total of 'TotalPrice' where 'discount' has a value of '1' 'times' '0.10'