You can include your custom checkout fields in PDF Invoices & Packing Slips which is generated by WooCommerce PDF Invoices & Packing Slips plugin. Please follow below steps to choose the fields which you want to include in Invoices.

  1. Go to Advanced Settings page.
  2. Tick the check box Enable PDF Invoice & Packing Slip support in Advanced Settings page.
  3. Choose the fields which you want to include in Invoices from the multi-select box Invoice Fields.
  4. Click on Save changes button.
Please follow below steps to choose the fields which you want to include in Packing Slips.

  1. Go to Advanced Settings page.
  2. Tick the check box Enable PDF Invoice & Packing Slip support in Advanced Settings page.
  3. Choose the fields which you want to include in Packing Slips from the multi-select box Packing Slip Fields.
  4. Click on Save changes button.