Hi,
iProperties saved within an .idw can be copied to another .idw by utilizing the design assistant. (copy > rename file). Do as follows: Launch Design Assistant, Open the file that contains the desired iProperties, Select the Manage button, Left Mouse Click (LMC) on the "None" under Action and select Copy, RMC on the File Location and specify a new directory or leave it the same, RMC on the Name and give the copied file a unique name, Hit the save button and iProperties are copied into the new file.