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Calculating the field with Previous instances

I have table that in the

 

Row 1 it should calulate     Balance = Excesshours - Excess hours used

 

From Row 2 it should go on with Balance = Balance(from previous row 1) + Excesshours - Excess hours used

 

it should carry on from last instance of the table 1 to first instance of the next table.

 

How do i do it ?

 

 

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