Yes you can. If your own company is located in Spain or Italy, this option will appear automatically when creating an invoice.
-
Go to Revenue > Invoices
-
Create a new invoice
-
The option for IRPF/withholding taxes will appear
-
The percentages are the correct ones issued by either Spain or Italy
-
Select the right tax rate
-
Fill in the other details of your invoice
-
Teamleader will calculate the tax automatically
-
Save (and book) your invoice
The PDF of the invoice will also contain the mention of the tax.