Is it possible to buy one ticket to cover a rail trip from Berlin to Prague over 5 or 6 days. We would like to stop overnight at Leipzig, Dresden?
In DB journey planner you can add stopovers with hours of stay there.
Unfortunately, an international one way ticket is only valid for two days. In addition, the journey via Leipzig is a detour that you have to book separately. If your route will be really Leipzig (overnight) - Drseden (overnight) - Prague, it is easier to book separate tickets for each leg. You should book the last segment, i.e. Dresden - Prague, with Czech Railways (www.cd.cz), as it is usually much cheaper there than with DB.