The VBSCan COST funding allows to reimburse expenses to participants who are enrolled in institutes located in one of the COST Countries Participating the Action, that are the 24 ones listed here in the table "Participations":
https://www.cost.eu/actions/CA16108/#tabs|Name:parties
Specific recommendations to be followed to claim for reimbursement can be found here
The general COST rules about reimbursements can be found in the COST Vademecum, linked here