how to invert debt and credit automatically?

When I import an OFX file from my VISA Credit Card account, the expenses comes with positive (income) signal.

How do I invert these signals without converting tWhen I import an OFX file from my VISA Credit Card account, the expenses comes with positive (income) signal.

How do I invert these signals without converting to a CSV file and import again (an idea I had...)?o a CSV file and import again (an idea I had...)?