You can create a schematic with the Foundation schematic editor and export it as a VHDL file. Just do the following:

1. Create a schematic using the schematic editor.
2. Click on "Options=>Create Netlist".
3. Click on "Options=>Export Netlist..."
4. In the "Export Netlist" window which appears, select the name of the .ALB file which has the netlist for your circuit. Set the "Files of type:" field to "Vhdl [*.VHD]" for exporting to VHDL. Then click on "Open" and the VHDL for the schematic netlist is dumped into a file with the same basename and a .VHD suffix.

The VHDL that is generated is purely structural, so don't expect any easily-understood coding style.