Generating an event copies over an existing event into a new event with the parameters from the existing event plus any new parameters you specify.

1. In Admin, under Data display, click Events.
   Note: The previous link opens to the last Analytics property you accessed. You can change the property using the property selector. You must be an Editor or above at the property level to generate an event from an existing event. If you don't see the Create event button in the top right of the table, then you don't have the required role to create events.
2. Click Create event, then click Create.
3. In Custom event name, enter an event name that conforms to the event naming rules.
4. In Matching conditions, specify one or more matching conditions. Google Analytics will copy over any event that matches the conditions you specify. For example, if you specify "event_name equals view_item", Analytics will copy over view_item to your new event.
   To define a condition to be case sensitive, use one of the operators that does not include the text "(ignore case)". For example, use "equals" instead of "equals (ignore case)" if you want the parameter to exactly match the value.
   Before you use a regular expression in a matching condition, review the best practices.
5. (Optional) By default, Copy parameters from the source event is enabled to use the parameters from the matching event. To turn off this feature, click Copy parameters from the source event.
6. (Optional) In Modify parameters, change any of the parameters from the matching event that you've copied over to the new event. For example, if you specify the view_item event in matching conditions, then you could modify the currency parameter. Learn more
   Note: You cannot apply mathematical operations to events using the event builder. Instead, you need to send the updated value in a new event.
7. Click Create.

Modifying an event overwrites an existing event by adding, changing, or removing parameters. Modified events are processed before created events are processed.

1. In Admin, under Data display, click Events.
   Note: The previous link opens to the last Analytics property you accessed. You can change the property using the property selector. You must be an Editor or above at the property level to modify an existing event. If you don't see the Modify event button in the top right of the table, then you don't have the required role to modify events.
2. Click Modify event, then click Create.
3. In Modification name, enter a name that describes the changes.
4. In Matching conditions, specify one or more matching conditions. You will be able to modify the event that has one or more event parameter that match all the conditions you specify. For example, if you specify "event_name equals view_item", you will be able to modify the view_item event.
   To define a condition to be case sensitive, use one of the operators that does not include the text "(ignore case)". For example, use "equals" instead of "equals (ignore case)" if you want the parameter to exactly match the value.
   Before you use a regular expression in a matching condition, review the best practices.
5. In Modify parameters, change any of the parameters from the matching event. Here are some examples of the modifications you can do.
   Note: You cannot apply mathematical operations to events using the event builder. Instead, you need to send the updated value in a new event.
6. Click Create.

Modified events execute in the order they appear in the Event modifications list.

Event modifications are applied to your data in the order they appear in the modifications list. This order can be important if you have modifications that rely on each other.

For example, if you rename an event in Modification 1 and use that new name as the basis for creating another event in Modification 2, then you need the modifications to execute in the order of Modification 1 > Modification 2. If those modifications are listed out of order, then Modification 2 will fail.

To reorder event modifications:

1. In Admin, under Data display, click Events.
   Note: The previous link opens to the last Analytics property you accessed. You can change the property using the property selector. You must be an Editor or above at the property level to reorder your modified events. If you don't see the Modify event button in the top right of the table, then you don't have the required role to modify events.
2. Click Modify event.
3. In the Event modifications pane, click Reorder.
4. Drag a modification from one position in the list to another as needed.
5. Click Apply.

1. In Admin, under Data display, click Events.
   Note: The previous link opens to the last Analytics property you accessed. You can change the property using the property selector. You must be an Editor or above at the property level to edit one of your generated or modified events. If you don't see the Create event button in the top right of the table, then you don't have the required role to create events.
2. Click Create event.
3. In the Custom events table, select the event to modify.
4. Adjust the conditions and parameters as needed.
5. Click Save.