@canyasa
Hello,
1) You can go to: wp admin > woocommerce > commissions to mark any commissions as paid, due or reversed. just tick the check box of the line item you wish to work with, and select the action from the drop down box at the top.
Youc an also sort the commissions by status (due, paid, reversed) by date, and by vendor.
2) The number next to the item in the parentheses indicates how many of that item has sold (total sales) on your website.