How to track employee hours and projects? How to manage inventory and purchase orders?

In BUSY doesn't have any provision to track employee hours and projects.
To create Purchase Order can follow these steps:
Step 1: Go to Administration and click on Configuration.
Step 2: Select Features / Options and click on Inventory tab.
Step 3: Here, you will find an option called "Enable Order Processing" click on the check box to turn it on and save.
Step 4: Now, go to the Transaction menu and select Purchase Order.
Step 5: Click on Add and fill all the required details such as Date, Voucher no. Items, etc.
If you want manage inventory and track stock of items in BUSY, you can use these steps:
Step 1: Keep your transactions up to date by recording them in dual and inventory vouchers. Make sure to enter the correct quantity and value of the items involved in each transaction.
Step 2: Choose the stock valuation method that best suits your business needs. 
Step 3: Monitor your inventory and stock levels by using various report options available under the Display menu. You can view the stock status report, inventory books, and inventory summaries for any item, group, or category.
Step 4: Compare your book stock with your physical stock and identify any discrepancies. If there is any difference in the quantity of any item, you can adjust it by passing a Stock Journal or Physical Stock voucher.
These process will help you to maintain accurate inventory records and avoid stock issues.