Should I send it via Email ?

There is no need for that, you could do it from here.

OK, thanks for the info. I have some additional questions:
I got three categories with different extra fields, is this working ?
Also, in an article, if I leave an extra field blank, the field will not be displayed, right ?
Would it be possible to show the price field with the currency symbol (in this case €) ?
Please find attached the file "data.zip".

This will work on all of your categories as far as you have somehow decided which part will remain with the same info (if applicable) in all three categories. What I mean is that you will have to decide first which extrafields you would like to show on the left part and which on the right. Maybe there is no need for all categories to show extrafields on the right, for example, but you need to narrow down which ones will it be.
It would help if you could sort this out.

If you leave the extrafield blank it won't show, yes.

The symbol of the price could be whatever you want. The field of the price is a textfield extra field type and the symbol goes along with the number. It's all up to what you will type in.

As an example, I take this site here: start.suche-seminarhaus.de/index.php/hotel/using-k2/trainer/item/178-harald-kurz
The extra fields "Name", "Email" and "Homepage" are shown on the right and that´s how it should be. So not sure if I need the extra fields also on the left side. Do you have an example for extra fields showing on the left side ?

Regarding the currency symbol, I will use a filter for K2 (K2 Search & Filter by Joomlart, demo.joomlart.com/joomla-extensions/) and I cannot type the currency symbol in the same field as the price because this won´t work.

OK. In your example the extrafields seem to work very nice in the right bar. On the left side by default the extrafields that we fetch are the ones with aliases perioda to periodd under Rates shown in our demo here: demo.nuevvo.com/#nokkori/index.php?option=com_k2&view=item&layout=item&id=129&Itemid=116.

Another way to show the currency is to put it in another extrafield and fetch that as well along with the price or put it in the template files right before the extrafield's value is called.
In the first case the drawback is that you will have to add it in every single item you add that has a price.

Thanks, Yiota. Could you please send me the edited file then ?
That´s a great idea to use the currency as an extra field. Not sure regarding the formatting or how to handle this.

Since I am at a little loss of what it is that you actually want to achieve with your extrafields would you be kind enough to revise it for me in order to get it right and sent you the file back as you want?

Thank you.

OK, that´s what I want to achieve:

We got three different categories at the moment, each category uses it´s own extra fields. The specified extra fields (not all extra fields !!!) should show on the right side of the screen, see also start.suche-seminarhaus.de/index.php/hotel/using-k2/trainer/item/172-gerald-sommer as an example.

You can find the category listings (specified extra fields) in the updloaded file "Categories_Nokkori.rtf", included in "data.zip".

Hope this clarifies the question.

I need you to verify on more thing for me. The fields you have provided in your *.rtf file are the aliases of the extrafields or the names? If they are the names I would like you to sent me the exact alias names for each one you have in your *.rtf file.

I'm sorry for asking so many questions but if the aliases of the extrafields are incorrect the file I'll sent you won't work.

Thank you.