You need to be mindful of the intent of the motions.
If it’s to improve the common property, then it’s purely optional according to the act. Yes there can be a motion to do something but that’s just an agreement between the owners
If the motion is to repair common property, then according to the act, it’s a non negotiable duty of the committee and OC. In that case a special levy needs to be raised.
If the owners are reluctant to do so, take the next steps which are mediation through fair trading and then a visit to NCAT.