How To Use Option Type Array?

Hello,

I got a problem while doing this task.

There is a field (Option Type) and has predefiend values. there is also another field of option type. when you validate first type then second field should have according values.

EX Conductor Type:={AAC,AAAC,ACSR,ASSR}

For AAC:={PART4,PART7}

For AAAC:={PART1,REF398,PART2};

For ACSR:={PART5,REF259,Part8};

and so on.

I got to know that there is option type array avalilable can i use that? or is there any possibility to assign value of 2nd field at runtime?