Yes, you can transfer at Schiphol if you are coming from a country or area that is considered safe due to low risk of coronavirus infection. If your onward journey is within 24 hours and you do not leave the airport, you are not required to present a negative test result for your transfer. https://www.schiphol.nl/en/page/welcome-back-transfers/
Can I transfer at Schiphol?
Yes, you can transfer at Schiphol if you are coming from a country or area that is considered safe due to low risk of coronavirus infection. If your onward journey is within 24 hours and you do not leave the airport, you are not required to present a negative test result for your transfer.
https://www.schiphol.nl/en/page/welcome-back-transfers/