To create a BOM, you can select the Add button. From there the first thing you need to select is the product it is related to, and you can select a product variant if desired. Then you will enter the quantity, unit of measure, routing, BOM Ty[e (Manufacture this product or Kit), then fill in the miscellaneous information such as the manufacturing readiness, which can be when the components for the 1st operation are available or when all components are available, and if the consumption of the product is strict or flexible. Once your data is entered, make sure that you select the Save button.
Once you select save, you will be taken into BOM where you can select the Add button under components on the right of your screen. Once selected you can select the component, enter the quantity, and unit of measure, and select the variants to apply this to. Then select when the component will be consumed in operation and you can manually control the order it appears in or leave this as it populates. Then you will save the component and can add as many as desired to the BOM. When you're ready to go back to the screen, after you select save, you can close the bill of materials to go back to the BOM summary page.
Bill of Materials (BOM) flows through to Manufacturing Orders (MO) which flow through to Work Orders (WO). When you create a BOM and select into the View mode you can Mark as To Do which will automatically generate a MO and the appropriate WO(s).