You cannot without relearning codes on the Pronto Remote. Girder uses IR Man which is just a unique number that the IRMan device uses to represent the codes. The only way to convert to Pronto format is to have a PC generate the needed codes and learn them on the Pronto.
Sorry I don't have a better answer. Please also edit the first post and correct the spelling on Girder to assist others with future searches. You might also provide a more detailed subject line such as "Convert Girder Codes To Pronto Codes"
