Having multiple carts allows you to organize the music you are purchasing however you like.
When digging for music across the store, you can create custom carts tailored to your personal preferences, whether by genre, style, BPM, or any category you desire, and easily choose where to send each track.
To do this, click the down arrow next to any Buy button A dropdown menu will appear, allowing you to create a new cart or select an existing one.
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SETTING UP YOUR CARTS
-- Log in to your Beatport account on beatport.com first
-- Click your account icon in the top-right corner, select Account Settings, and click Cart Preferences
OR go directly to beatport.com/account/carts
On the Cart Preferences page, you will see two main sections:
- Pro Carts: Displays your Main Cart and your Hold Bin (where you can store tracks for later)
PLEASE NOTE: 
-You cannot delete or rename your Main Cart (default cart) or Hold Bin
-You cannot set your Hold Bin as a default cart.
My Carts: Lists all custom carts you have created
You can create as many carts as you wish by clicking on the New Cart button : add a name and click on Save.
Click the gear icon
next to any custom cart to edit its name or set it as your default cart.
PLEASE NOTE: 
When you set a cart as your default, any track you click Buy on across the store will automatically go into that cart
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HOW DO I DELETE A CART?
To remove a cart, click the X icon next to it. A confirmation prompt will appear to prevent accidental deletion.
WARNING: Once a cart is deleted, it cannot be recovered
You can quickly view an overview of all your carts from any page on the store by hovering your mouse over the Cart icon in the upper-right corner:
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HOW TO MOVE TRACKS BETWEEN CARTS
You can move individual or multiple tracks between carts by following these steps:
Log in to your Beatport account
Hover over the Cart icon in the upper-right corner:
3. Select the cart containing the tracks you want to move.
4. Locate the track you wish to transfer and click the MOVE TO... icon next to it.
5. Select the destination cart from the dropdown menu.
6. You can also move multiple tracks at a time from one cart to another by checking the white boxes next to each of the tracks you would like to move and then using the MOVE TO... icon on the top pf the cart page.
You can also also click on "Select all" option to move all tracks from one cart to another: