Hi @affordable
WooCommerce does have the capability to allow for additional costs, such as shipping, to be added to an existing invoice. However, this would require a combination of manual intervention and the use of specific plugins.
First, the initial 30% down payment can be handled using a plugin like WooCommerce Deposits, which allows you to accept partial payments.
If the shipping costs are not determined until after the order is assembled, you will need to calculate this manually. Once the cost is determined, you can create a separate invoice for this additional cost. You can use the WooCommerce PDF Invoices & Packing Slips plugin to create this additional invoice.
Unfortunately, there isn’t a way to automatically add these additional costs to the original invoice within WooCommerce. The customer would receive two separate invoices – one for the initial down payment and a second for the remaining balance including the shipping costs.
Remember, it’s important to clearly communicate this process to your customers to ensure they understand they will receive a second invoice with the remaining balance.
I hope this answers your question. If you need further assistance or have any other questions, feel free to ask. Thanks!