Formula for running total in calc

Very basic question I know, but I couldn’t seem to find the answer in Help.
I’m keeping a simple tally of expenditures down one column in Calc, and want to have the running total appear automatically in the next column. How do I do that please?

Assuming expenditures in A:

B1: =A1
B2: =A2+B1

Drag B2 down as far as needed.

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Lovely - thanks for the quick response.

Here’s a example and tutorial on running total column in Calc: