You can create as many bidding groups as you want, and you can still cancel open bids prior to having them accepted.
Example: Bid on Multiple Vehicle Shipments
First vehicle shipment bid
A Service Provider is making a trip from Austin, TX to New Orleans, LA and only has room for two vehicles in their car trailer. They find four vehicle shipments along their route and are willing to service any two.
When they bid on the first vehicle, they create a new "group" called "Austin to New Orleans" by selecting "Create New Bid Group" (A) and set a match limit of two (B).
Remaining vehicle shipment bids
The Service Provider then bids on the remaining three vehicles and attaches them all to the same group (C). They can now view and manage their bids and groups from My Bid Groups.
My Bid Groups
Two shippers accept the Service Provider's bids. Because the match limit on "Austin to New Orleans" bids is reached (D), the other two bids are automatically and immediately canceled (E).