When adding a custom field from the Tag type, allow ideas portal users to either select existing tags or to create new ones on the fly.
The tags will be used to represent individual customers who asked for this feature, so later on this can be used to filter ideas. This is not possible if we use free text where customers can only be comma separated.
Thank you for your idea. We currently do not allow portal users to add new values so that the product team can control the options displayed.
For the use case mentioned in this idea, we would recommend using proxy votes. This would allow portal users to add new organization when logging votes.
Given the explanation above and the current capabilities with proxy votes, we are unlikely to implement this idea at this time. We hope you can understand.