There is no OR  in the IF field, but there are other ways to achieve the
same effect, depending on exactly what you need.

{ IF "{ MERGEFIELD Company }" = "Company A" "X" "Y" }
{ IF "{ MERGEFIELD Company }" = "Company B" "X" "Y" }

is one way that may be enough in simple situations.

{ COMPARE "{ MERGEFIELD Company }" = "Company A"  } returns 1 if Company is
"Company A", 0 otherwise, so you can use

{ IF { =or({ COMPARE "{ MERGEFIELD Company }" = "Company A"  },{ COMPARE
"{ MERGEFIELD Company }" = "Company B"  })  } = 1 "X" "Y" }

or just use addition, e.g.

{ IF { ={ COMPARE "{ MERGEFIELD Company }" = "Company A"  }+{ COMPARE "{
MERGEFIELD Company }" = "Company B"  }  } > 0 "X" "Y" }

Peter Jamieson