This powerful feature would allow you to group multiple rate periods to be pushed to your connected channels and website. You can use rate categories to label rates and push different price-points.
Unless you specify otherwise, a "default" rate category will apply to all rates when they are first created.
Create New Rate Category
First, navigate to your rental by clicking on it from the calendar or from More > Rentals.

Next, click on the Rates Table tab, on the Add Rates button then on Add Standard Rate.

On the pop-up, you can choose an existing rate category or manually type in a new rate category.

Here is an example of two Standard Rates - one with category Airbnb and one with category Booking.com. This allows you to push different rates to different channels.

Add Rate Mappings
Rate mappings allow you to specify which Sympl rate categories should be pushed to specific channel rate categories. This feature allows you to update all linked channels with one click, and is required for automatic Dynamic Rate updates.
Navigate to your rental then to the Rate Mappings tab.

Select "+ Add Mapping".

Complete required info:
Select existing Sympl rate category
Select a channel (your connected channels for this rental will appear)
Select a channel rate category

As an example, you may want to map your Booking.com rate category in Sympl to the Standard channel rate category in Booking.com; repeat this process to map your Airbnb rate category in Sympl to Airbnb.
Click the "Save" button to return to the Rate Mapping tab of your Rental.
After creating the mapping, you should turn on the Auto Sync toggle to automatically send your Standard rates to your mapped channels whenever there is a new or updated rate for that rental. For Dynamic Rates, Sympl will automatically update your channel rates as your availability changes.
The Push All Rates button allows you to push all your rates at once to your mapped channels for this rental.
Note: If you have set up channel adjustments for the rental, these rates take priority and will be sent to the channels during the rate push, even if you set mappings with other categories. Channel adjustments are applied to the "default" rate category.