It’s uncommon to have all the following rules delegated in a single template as shown. Here are some common event rules to be familiar with:

Enable Multi-round Bidding
If enabled, an event owner can create multiple bidding rounds within a single event. Event owners can select the participants and content to include in later rounds.
Bid Improvement rules
Must participants improve their bids. If this rule is set to Yes, the system validates bids based on the bid improvement rules. It rejects bids that don’t meet the requirements of the improvement rules.
This rule is the main factor that dictates if the event is competitive and doesn’t apply to RFIs.
Allow Participants to Submit Bids by E-mail
When enabled, participants can submit bids by e-mail for noncompetitive events (Must participants improve their bids must be set to No).
A supplier can submit a response to the event by e-mail. The response indicates that the supplier agrees to, and accepts the terms specified in the bidder agreement that was sent as an attachment to the invitation mail.
Can Participants Create Alternative Responses?
Alternative bidding gives suppliers (participants) the ability to submit alternate bids after they've submitted a primary bid based on a guided sourcing event as you’ve defined it. You can then view the primary and alternative pricing responses and decide what meets your needs the best.
Only alternative pricing is available in guided sourcing currently, as supplier bundles and volume tiers aren't supported.
We recommend that template authors create templates with alternative bidding rules configured for event creators. The alternative bidding rules in a guided sourcing template include:
- Can participants create alternative responses?
- Can participants create alternative pricing?
- Include alternative pricing bids when bids are ranked.
- Should questions be visible in alternatives?
- Should there be a limit on number of alternatives?
- Alternative Limit value.
Out of these rules, only Can participants create alternative responses? is available on the Set event rules page for a guided sourcing event.
When preparing the event, new items and lots are created with a term that is marked editable in alternatives:

The supplier first submits a primary response and has the option to create an alternative response where they can change the term values that are marked editable in alternatives. The price and color of pens can be changed in the example below:

Note
For details about how to configure an event template for alternative bidding, refer to Configuring Event Templates for Alternative Bidding and Configuring Event Templates for Guided Sourcing.To allow suppliers to add items and lots to alternative bids, enable the Allow suppliers to add items event rule.
Suppliers can select Add New Lot on the lot selection page to add items and lots.

After a supplier adds an item, they can submit a bid for the item.
Note
To create an event that lets suppliers add items and lots, a template author must create an event template with event rules and definitions for supplier-added items, as described in Configuring Event Templates for Supplier-Added Items.