I want if I fill details in A and B then I will get A+B automatically in "Received Qty.

Case 2: In the below table, I want if I fill details in A and B then I will get A+B automatically in "Received Qty. "How can we do that?

Yes it is possible to perform calculation in "Input table" field, but you will have to add the field type as text box or numeric field.

Once the field type is set as text box or numeric, you can add the condition in form to read the other cell value and insert the calculated value in the specific cell. You may like to take a look at the following guide which should help you: https://www.jotform.com/help/414-calculate-values-in-the-input-table-through-condition

Hope this helps.

Do try it out and get back to us if you have any questions.