Hi Wdimn,

You can try out the Purchase Order Line Components functionality.  It is possible to add components manually.

Steps to follow:

1. In the Purchase Order window, query for the purchase order to which you want to connect the component parts. 
2. On the Part Order Lines tab, select the desired purchase order line and choose Component Parts in the Operations menu. This opens the Purchase Order Line Components window.
3. Click New. The order number, line number, and release number are automatically retrieved from the purchase order. Normally, the line item number is automatically generated by the system when saving the component line, but you can also manually specify this number.
4. In the Sales Part No field, specify the component part (the sales part) that will be connected to the purchase order. Either enter the short code for the sales part or indicate it by using the List of Values.
5. In the Qty Required field, enter the required quantity of the component parts.
6. Enter the date on which the supplier needs the component parts.

Prerequisites

• The purchase order line must have been entered and saved.
• The parts to be connected must have been entered as sales parts. This makes it possible to include goods that are not entered as inventory parts, such as packaging material and manuals.
• The Purchase Component Method at the company site level has to be set as Customer Order to enable the facility to manually add component parts to purchase order line.

You can refer to F1 Help documentation for further information in this regard.

Thank you very much @Sameera Perera , will give it a go.