continuous form calculate balance

[sekoma]

hi
the form contain combo box that linked with sub form continuous contain amount + balance , so i want record by record give me balance foe exam: for first record i add amount 5 $ it equal balance for second record when i add amount 10 $ the balance field =5+10=15 and third add amount 2$ the balance =15+2=17 that's like the attach photo
regards

[Welshgasman]

Crossposted, first at https://www.access-programmers.co.uk.../#post-1833578