Hi Swapna Chennam , you can check Incorta's formulas out in more detail here:
Details around the "OR" function are in the Boolean section. E.g.
OR(startsWith(myschema.mytable.HTSNum1, "stringValue1"), startsWith(myschema.mytable.HTSNum2, "stringValue2"), startsWith(myschema.mytable.HTSNum3, "stringValue3"))
Both functions used above, return "true" or "false". Thus, if you're using it as a filter, set your operand to True.