The steps to split an order on eBay are as follows:

1. First, you need to make sure that the order meets the splitting conditions: only orders with a quantity of items greater than 1 can be split.

2. Log in to your eBay account and go to the "My eBay" page.

3. Click the "Sold Items" link and find the order you want to split.

4. On the order details page, click the "Split" button.

5. The order amount of the new order will be displayed as 0 to distinguish between the main order and the new order.

6. Splitting an order after payment is generally for the convenience of financial settlement. For example, if a user purchases goods from multiple stores in one order, the platform needs to split the order according to the stores across the order after the user pays, and allocate the amount paid by the user to each store.

7. If the split is wrong, you can merge the orders manually.