Whenever two or more trusts heretofore have been or hereafter shall be created primarily for the benefit of the employees of the same employer or their families or appointees under any stock, bonus, pension, disability, death benefit, profit sharing or other employee-benefit plan or plans and the court of common pleas having jurisdiction over any one of such trusts, upon the application of the employer who established such trusts, any trustee thereof or any other party in interest, shall find that such trusts can be more effectively administered if they are combined, the court, in its discretion, after such notice to parties in interest as the court shall direct, may order that they be combined into one trust, which may be one of such existing trusts, in the manner and to the extent that the court shall approve, but not so as to violate any express provision to the contrary in any conveyance creating any of the trusts so combined.