You can add a System to your account by going here:
Logon to DJ Event Planner -> Setup -> Equipment -> Systems.
Systems should be considered one item and that one item includes every piece of equipment needed within its description to make it a complete system. Systems are added to an event as a whole. Once you have a system established, then those pieces of equipment that are included are no longer available to be used as standalone pieces of equipment. As an example, if you own 5 hand held microphones, and have two systems in place on your account that both include a hand held microphone, then you can only list the remaining 3 microphones as standalone equipment.
Standalone equipment is a separate piece of equipment...here:
Logon to DJ Event Planner -> Setup -> Equipment -> Standalone Equipment.
Standalone equipment are separate pieces of equipment that you can assign in quantities. Quantities are set up for the piece of equipment when adding it to your account. You would assign each separate piece of equipment to an event as needed.
A single piece of equipment that is entered as a standalone equipment item, can not also be added into an equipment system at the same time. Also, you can not assign a single piece of equipment to more than one system. Those items (pieces of equipment) entered as an equipment system can not be borrowed or used as a standalone piece.
Should you prefer not to set specific systems, you can create a list of every single piece of equipment in your entire inventory. You can then set the quantities per item.
