A CloneParam symbol will copy all of the parameters from its target symbol. This is useful for OCAD maps that have multiple versions of each symbol, for example in the default symbol set 208.0 and 208.1 will convert the same.
Additional parameters may be added to a symbol that has a CloneParam, they will get included in addition to all of the parameters that are copied.
See the default for symbol 402.0 for an example:
OPTIONS
Clone Symbol
The symbol number to copy the parameters from.