I am new at EXCEL.
I am attempting to setup two columns.
First column I want to enter amount of an item purchased
Second column I want to start with a balance and as I enter amounts
purchased in the first column I would like the balance column to reduce as I
progressively enter amounts in the first column.

As an example:
Amount Column& first entry $5.00
Balance Column Starting Balance $250.00
After I insert the $5.00, I would like the second column under the $250 to
show $245

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Thank you in advance for your assistance
HankL