Can wedge and dash bonds on 1, 2 position of cyclohexane ring be used to signify trans orientation of the substituents?
So if you drew a wedge in position 1 and a dash in position 2, it would mean that they are on the same plane - either both axial or both equatorial - assuming that the ring was in a chair conformation.

However, if the objective is to show the structural isomers very clearly, it may be better to use either the chair conformation sketch:



... or the Newman Projection: