Bosnia and Herzegovina and Great Britain booked their spots in Division A Wednesday night with wins over Norway and the Netherlands respectively.
Both teams won comfortably on aggregate though Great Britain struggled for the second win, getting 14 points and 10 rebounds from Megan Moody in recording a 60-58 victory.
Bosnia-Herzegovina broke open a close game in the fourth quarter to win at Luxembourg and remain undefeated after four games in EuroBasket Division B.
Milica Deura had 18 points to pace the team from the Balkans, who prevailed 71-55.
Bosnia-Herzegovina gave Great Britain's women a basketball lesson in the first half and rolled to a decisive 82-51 EuroBasket Division B triumph in Sarajevo.
With both sides having won their opening two Group B games, the contest beforehand had the look of a thriller but soon after tip-off, the hosts stamped their authority on proceedings.
Bosnia-Herzegovina needed overtime but finally beat Portugal 71-65 in Sarajevo on Wednesday.
Playing in their first game of EuroBasket Women Division B this year, the hosts trailed 38-27 at half-time but closed the gap to 46-40 after three quarters.
Bosnia and Herzegovina
Branilaca Sarajeva 11/III, 71000 Sarajevo, BIH
+387 (33) 44 57 20
+387 (33) 56 61 31
President: Elmedin Konakovic
Secretary General: Harun Mahmutovic
Press contact: Nina Basovic