The IQs do show Subtract Manual Calculations, Subtract Transaction Adjustments or Subtract Costing Adjustments as negative values.
You can use Save Grid from the IQ Report grid to create an Excel File and update the values by:
multiplying the value by minus 1, where the transaction type is a subtract, or
insert the negative in front of the values for these transactions.
To see the values, review either the Transaction Report or Employee Enquiries and check the Transaction Type.