Why don't you run the trial balance for the month choosing the option to print "Net changes for the period" then choose the periods that you want, the first period would be the end of the prior period = opening balance and the closing period is the last period so that you have the closing balance and then you delete the column that shows the net movement if you don't want that.

Why don't you run the trial balance for the month choosing the option to print "Net changes for the period" then choose the periods that you want, the first period would be the end of the prior period = opening balance and the closing period is the last period so that you have the closing balance and then you delete the column that shows the net movement if you don't want that.