Running total with a condition or...?

[cristian2]

Hi all,
Sorry bad topic…
I need to calculate a running total but need to reset the total on a condition.
I have this table - Date is the only dimension - all the others are table calculations:

        Date, Registrations, Expected Registrations, Expected reached
        2020-03-01, 5, 4,1
        2020-03-02, 7, 5,1
        2020-03-03, 8, 6,1
        2020-03-04, 2, 5,0
        2020-03-05, 5, 4,1
        2020-03-06, 7, 5,1
        2020-03-07, 8, 6,1
        2020-03-08, 2, 5,0

Expected result with running total - the condition is that while “Expected Reached” <> 0 running total should be calculated. If “Expected Reached” = 0 the running total should start over from 0:

Date, Registrations, Expected Registrations, Expected Reached, Running Total
            2020-03-01, 5, 4,1, 1
            2020-03-02, 7, 5,1, 2
            2020-03-03, 8, 6,1, 3
            2020-03-04, 2, 5,0, 0
            2020-03-05, 5, 4,1, 1
            2020-03-06, 7, 5,1, 2
            2020-03-07, 8, 6,1, 3 
            2020-03-08, 2, 5,0, 0

Any ideas or suggestions?