Nine teams have already secured promotion from the third division to the second division B, winning through the play-offs between the eighteen regional group champions. These were as follows:
Atlético Málagueño, Calahorra, Conquense, Don Benito, Espanyol B, Gimnástica Torrelavega, Internacional de Madrid, Oviedo B, Teruel.
The remaining nine spots will be decided after a knock-out stage which finishes towards the end of June. (27.05.18)
The following teams qualified after the second knock-out stage: Atlético Levante, Atlético Sanluqueño, Almería B, Castellón, Durango, Ejea, Langreo, Salmantino and Unionistas Salamanca. (24.06.18)