Select the “Mass create” option on page 1 of the Grid Wizard to enable mass creates for grids. Hover over the “More” button on grids and click the “Mass Create” link to open up the Mass Create widget. This widget is very similar to the Mass Update widget. You can specify the values for any object, and create as many records as you’d like (respecting the admin defined privileges, of course).
Fill in the values for the fields you want to mass create in the widget. Once you click on a widget field, it will turn orange indicating that the field value will be used to mass create corresponding fields in the Grid. Click the “Clear” link next to the field if you don’t want that field to have a value when mass creating. You will also have to specify the number of records you’d like to create at the top of the widget.
Create parent records by specifying field values in the parent row, specifying the number of records you’d like to create and clicking the create parents button. Optionally, you can specify values in the related objects too. This will create one related record under each newly created parent record. E.g. you can create 20 new Account records with an Opportunity and a Contact related to them with the field values you specified.
Create related records by selecting existing parent records on the grid, specifying field values in a related row, specifying the number of records you’d like to create and clicking the create related button. You can specify field values in more than one related object at a time. For example, you can select 5 Accounts on the grid and create 2 Opportunities and 2 Contacts under each of them based on the field values you specified.
And, just like when mass updating, finalize your changes by clicking the “Save” button on the Grid.