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## Resource: Sample Use Cases and Flows

## Article: Sample Use Cases and Flows

## Article Link: https://dev.wix.com/docs/api-reference/business-solutions/events/event-management/categories/sample-use-cases-and-flows.md

## Article Content:

# Categories: Sample Use Cases & Flows

This article shares some possible use cases your app could support, as well as a sample flow that could support each use case. This can be a helpful jumping off point as you plan your app's implementation.  

## Sync categories across all sites

If you have multiple event sites using your app, you may need to sync event categories across these sites. For example, if you've added a new city for some of your concerts, such as "Chicago," you’ll need to create a new category named "Chicago" and apply this change to other sites as well.

To sync the category across all sites:

1. Call [Query Categories](https://dev.wix.com/docs/rest/business-solutions/events/categories/query-categories.md) on the site where you created a new category.

1. Extract the entire `category` object. Remove unnecessary fields, like `createdDate`.

1. For all other sites, call [Query Events](https://dev.wix.com/docs/rest/business-solutions/events/events-v3/query-events.md) and extract the IDs of all relevant events.

1. Call [Create Category](https://dev.wix.com/docs/rest/business-solutions/events/categories/create-category.md) on the other sites, passing the new category to each.

1. Call [Bulk Assign Events](https://dev.wix.com/docs/rest/business-solutions/events/categories/bulk-assign-events.md) and assign the new category to all the previously extracted events.