The arguments for the method are:
| Arguments | Description | 
|---|---|
| [ in]operand | A Variantof typeString, a numeric value, or anOraIntervalYMobject to be subtracted. | 
The result of the operation is stored in the OraIntervalYM object, overwriting any previous value. There is no return value.
If operand is a Variant of type String, it must be in the following format: [+/-] YEARS-MONTHS.
If operand is a numeric value, the value provided should represent the total number of years that the constructed OraIntervalYM object represents.