how can i save or sum up 2 value in mc access?wat am i trying to said is...for example, now i'm doing the inventory database..once i open the form which i enter the units in..and save..when the next time i enter the new units in again..the total amount can b sum up in the access...how can i do tat?i did not done any coding yet at this moment.besides, i stil need to do a report wer the details of the balance of th stock is required.the balance will b the difference between the units in and units out at the end of each month.and how can i do this?plz help me up..thx..