1. I is for regular Inventory. You will hear notifications on items that are checked out to system patrons that should not be book-dropped. 
2. IB is for Inventory Bookdrop. You will hear notifications on items that are checked out to system patrons that should be book-dropped. 
3. IBS is for Inventory Bookdrop Suppressed. You will NOT hear notifications on items that are checked out to system patrons, and should be book-dropped.
4. IS is for Inventory Suppressed. You will NOT hear notifications on items that are checked out to system patrons, and should NOT be book-dropped.

Go to Tools > Inventory, then select Session at the top. Click on either the + in the bottom left, or Create Session. Give the session a name and set the Inventory By to be how you want to split the sessions. If you use call numbers as the Inventory By, you will need to make sure that in both the From and Through fields, there are the exact same number of characters–for example, From 222.222 Through 333.333, and not from 222 through 222.999.

Usually this means the wrong import type is selected on the left. Make sure you have Items selected, and the import should run correctly.

To forgive a charge for an individual patron, use Circulation.

1.  Make the patron current and go to the Charges tab. 
2. Select the charge (or by holding <shift> or <command> you can select more than one). 
3. Click Make Payment.
4. Enter the amount to forgive in the forgive field, and click Process. 

To forgive charges in batches, use the Forgive Charges utility. 

1. Go to Tools > Utilities > Patrons > Forgive Charges.
2. Use the Selections tab to choose who you are forgiving the charges for.
3. Use the Options tab for what type of charges to forgive, or in a specific date range. 
4. Click Run