How does board approval of expenses work vs. need to pay bills between meetings

[Guest boardnightmare]

Our bylaws say that the treasurer will pay funds with the approval of the board.  The question is, if we have a budget line item that says, say, 10,000 for new office furniture, which has been approved by the membership at some point, can the treasurer then write a check for 2,000 for chairs without additional approval?  Or does the board need to approve every check that is written?  How can we operate that way?  I"m not sure if this is something in Roberts or not.  

[Guest Who's Coming to Dinner]

No, it's not in Robert's. You will need to examine the resolution which enacted the budget to determine if the treasurer is empowered to spend budgeted funds without further approval.