Problems merging 4 columns into 1 and charting them in Data Studio

I would need to unify the data from columns Metod_1,Metod_2,Metod_3,Metod_4 and Metod_5 into a single column, but keeping the resolution date data associated to each row:

Having resolved the above issue, in my Data Studio report I would need to get the above information to display in this way, filtered by "Resolved" date:

Thanks!