If you want to temporarily override the FieldStack generated recommended inventory numbers for an item, you can do this in the Min Qty tab.  These guarantees/overrides will remain in effect until the expiration date passes.  This is a good way to make sure you have full end caps to help promote an item than might not normally sell at a high velocity.

A minimum of -1 will prevent the item from re-ordering at all.

Right-clicking on the expire date, gives you the ability to set all to be the same as the current, set a default number of days (so you just type the minimum number and the expire date automatically fills) in or you can clear all which will revert you back to using the FieldStack generate values.