From the rules:
(4.53) Nayakas. A Nayaka Commander may give Line Commands
only to the unit type specified on its counter (e.g. “Inf” for Infantry
units, “Cav” for Cavalry units, “EL” for Elephant units, etc.).
Nayakas assigned specifically to cavalry or infantry may only give Line Commands or Individual Orders to Cavalry or infantry units,
respectively (no combination with other unit types). Nayakas assigned
to Elephants or Chariots may combine infantry with the
Chariots or Elephants as part of a line. The counter designation “left
flank,” “right flank” etc. is for setup purposes only.
A question because it's not explicitly stated - are Nayakas that are assigned to Elephants or Chariots able to give Individual Orders to any type of unit?