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In the case of application of a static electric field in VASP, we use the EFIELD tag and IDIPOL refers to the direction. Does a negative EFIELD value refer to change in direction? For example lets say
EFIELD=1.0
IDIPOL =2
So this means electric field is parallel to b (lattice vector)

Does EFIELD=-1.0 mean antiparallel to b ??

Sorry, I made a mistake. Yes, the sign of EFIELD indicates the direction. In the directory where there is the test suite there is the example NaCl_field_1, whose INCAR contains
LDIPOL = .TRUE. ! selecte active dipole corrections
IDIPOL = 3 ! correction in z direction
EFIELD = -.1 ! apply a field of -0.1

Oh Okay Thank you