The effect of annealing temperature on structural, electrical and magnetic properties of bulk (Nd$_{0.6}$Sr$_{0.4}$MnO$_3$)$_{0.99}$/(CrO$_3$)$_{0.01}$ and (Nd$_{0.6}$Sr$_{0.4}$MnO$_3$)$_{0.98}$/(CrO$_3$)$_{0.02}$ compositions are investigated. X-ray diffraction show that (Nd$_{0.6}$Sr$_{0.4}$MnO$_3$)$_{1-x}$/(CrO$_3$)$_x$(NSMOC) crystallize in a single-phase rhombohedral structure for the as-prepared and annealed samples. Electrical measurement show a metal-semiconductor transition temperature (T$_{ms}$) for the two compositions. It is observed that T$_{ms}$ increases with thermal treatment. The magnetoresistance MR has a negative sign and it records the highest value for annealed sample at 800$^\circ$C for the two compositions. The sign of S is a negative sign for the two compositions. In addition, the calculated Power factor show that the as prepared samples achieve high power factor, therefore our compositions can be considered as the thermoelectric materials.