Total Posts: 867
I checked the link you provided and see that most likely you have already fixed the issue, as the price is changing depending on the custom option chosen. In case you have any other issue with custom options, let me know.
For other forum users who encounter the same issue I offer to set Price to Fixed and do not forget to indicate the value.
Also I suppose that further when you will multiply your products and you will face the issue, that you need to add custom options one-by-one.
To add them in bulk, you can use Store Manager for Magento application. Using it you will be able to create products and then clone custom option (in case you have the same custom options for products) or use Import/Export of custom options. As I know default import mthod does not have such functionality.
In any case, there is 14-day free version of Store manager for Magento, so you can give it a try -
Hope it will be useful.