Hi vivekparimi,
You can create a new expression inside of our Field Calculator. Please see our documentation on this feature and the link to the available Field Calculator Recipes. As for your specific question go ahead and select the object of interest and open the Field Calculator and Add a new Named Expression as follows:
Input->Quantity->E_t: Vec:
Vector->Material->Conductity(cond)->Multiply: CVc: cond*(
General->Complex->Real: Vec: Real(cond*(
Add->Name: Vector_Jcond_t
Input->Quantity->E_t: Vec:
Vector->Material->Conductity(cond)->Multiply: CVc: cond*(
Vector->Mag: Scl: Mag(cond*)
Add->Name: Mag_Jcond_t
Regards,
Charlotte