Disable custom field based another another field value selection

[Mandia]

For ex.

If I choose "Work Type Category" = Development or = Testing, then I will let everyone set values in "Planned Review Time". Else if I choose  other values then disable the "Planned Review Time".

I want to use sil script to implement this.

Could you please help me to let me know how to write the sil code?

Thanks,

Mandia