See explanation below.
* Go to Navigation pane > Modules > Sales and marketing > Prices and discounts > Trade agreement journals.
* Click New.
* In the Name field, click the drop-down button to open the lookup.
* In the list, select S_Price (Sales Price Adjustment).
* On Action Pane, click Lines.
* In the Account code, select 'All' (for All customers)
* In the Item code field, select 'Table'. This will allow you to select a specific item.
* In the Item relation field, click the drop-down button to open the lookup.
* Select the Surface Pro 128GB.
* In the From field, enter a minimum quantity (1).
* In the To field, enter a maximum quantity (50).
* In the Amount in currency field US Dollars in the Currency field.
* Configure another price bracket with a minimum of 51 units, a maximum of 100 units and a price of 720 US Dollars.
* Under the Details section, in the field, enter a date from which this agreement will be valid (January 1st 2020).
* In the To date field, enter a date to which this agreement will be valid (December 31st 2020).
* Click Save.
* Click Validate.
* Click Validate selected lines.
* Click OK.
* Click Post.
* Click OK.
Reference:
https://docs.microsoft.com/en-us/dynamics365/supply-chain/sales-marketing/tasks/create-new-trade-agreement

See explanation below.
Explanation
When you configure Direct Delivery (direct from the Vendor), a PO is created to purchase the item from the Vendor and have it shipped directly to the customer. The instructions below include generating the PO and a product receipt. These steps may not be required in the exam but are included for reference.
1. Go to Navigation pane > Modules > Accounts receivable > Orders > All sales orders.
2. Select New.
3. Search for and select sales order number 000720.
4. On the Action Pane, select Sales order, then select Direct delivery. The Create delivery page lists all the open sales order lines as copied from the sales order.
5. Select the sales order line for the product named Projector Television.
6. The Vendor account field will be populated. A message informs you that the purchase order has now been created.
7. Expand the Line details section.
8. Select the Delivery tab and verify that the Direct delivery field is set to Yes.
9. On the Action Pane, select General
10. Select Related orders.
11. Select the link in the Purchase order
12. Expand the Line details section and select the
* The delivery address for this purchase order line is the customer's delivery address and not your company's address.
13. Select the Delivery tab.
Like the sales order line, the associated purchase order line type is also set to Direct delivery.
14. On the Action Pane, select Purchase
15. Select Confirmation.
16. Select OK.
17. On the Action Pane, select Receive
18. Select Product receipt.
19. In the Product receipt field, type a value.
20. Select OK.
21. On the Action Pane, select General.
22. Select Related orders and highlight the desired record.
* After the purchase order has been updated as received, or in other words, after the vendor has shipped the goods to your customer's address, the status of the originating sales order is automatically updated to Delivered.
* The sales order can now be invoiced.
23. Select OK.
24. Close the page.
25. Select OK. Close the pages and return to the home page.
Reference:
https://docs.microsoft.com/en-us/dynamics365/supply-chain/sales-marketing/direct-deliveries

Reference:
https://docs.microsoft.com/en-us/dynamics365/unified-operations/supply-chain/inventory/inventory-blocking

References:
https://docs.microsoft.com/en-us/dynamics365/supply-chain/procurement/set-up-external-catalog-for-punchout