When property is held or to be held in a trust which is or would otherwise be partially exempted from the GST due to the allocation to such trust of a GST exemption, a fiduciary is authorized, but not required, to divide the trust into two separate trusts, of equal or unequal value, in order to create one trust entirely exempt from the GST and a second trust entirely subject to the GST. Other terms and provisions of both trusts will remain substantially identical in all respects to the original trust.