How do I apply a Modifier Group to an Item?

How to add Modifier Groups to items:

1. Select Menu in Partner Portal.
2. Click on the Items tab.
3. To add a modifier group, either search for the item in the search bar or scroll down and click on the item you would like to modify. 
4. Scroll down to Modifier Groups
1. Click on the drop-down list to select a modifier group. 
2. Create a new modifier group if it does not already exist by selecting + New Modifier Group on the right. For more information, see "How do I create new modifier groups?"
5. To organize Modifier Groups, select the dotted-square icon (on the left-hand side) and drag it to the desired position. Click Save.