Subcommittees shall be created only by majority vote of all members appointed to the committee and with the prior approval of the legislative council. A subcommittee shall be composed of at least one member from the senate and one member from the house of representatives, and at least one member of the minority party shall be a member of the subcommittee. All meetings and expenditures of a subcommittee shall be approved by the full committee in advance of such meeting or expenditure, and the approval shall be shown in the minutes of the committee.