155 [158BFA], [sub-section (1A) of Section 201, Sections 210, 211, 234A, 234B, 234C], 271 and 273 or otherwise), general or special orders in respect of any class of incomes [or fringe benefits] or class of cases, setting forth directions or instructions (not being prejudicial to assessees) as to the guidelines, principles or procedures to be 87 followed by other