design of look-up table for logic element

I am working in the area of performing dynamic reconfiguration using soft-core processor.Now i need to design the logic element which is the basic building unit of altera fpga in order to interface with nios-ii processor and for run-time reconfiguration.actually i want to know,how to make logic element and the vhdl code to make logic element as the custom component. plz help me.I didn't got a clear view