I'm sorry about the title (I think it's a bit confused :D) I can explain better what I need to do. I have one product with several fields, among which: title,date, description, price, etc... I would add in a field (for example: description) a value of another field (for example: price). I would also that this setting is applied to content type because that field must always belong to the other field, for every content creation.
I searched on Google and it seems the module Token could be a solution but there are many tutorials (and also different among them), so could you help me. Are appreciated other solution, no just Token. Thank you