The "Subhire"module allow fast and simple combination of multiple subhires. On the left side, the module shows the shortages in the selected time frame and the created subhires on the right side.
If an item on the left is marked as red, no subhire has been added yet. If you first select a shortage from the left side and an existing subhire from the right side you can then choose "Add to existing subhire" on the top.
In the new po-up window that opens up, you can select if you want to add the selected item to an existing subhire. After doing so the tab "Equipment" shows the previous "old" equipment and the equipment you just added.
By saving this subhire the item on the left is not marked as red anymore, which means it is being subhired.