I got a 2 year multi entry visa 18 months ago for the Schengen zone issued by Germany. It expires some time in December this year. Maximum stay is 90 days and I have already used up 80. I have not been in the Schengen zone in the last 180 days so there is no issue with the 90/180 rule. I am planning another trip to Germany soon, but this should be longer than 10 days.
So I guess I could cover the first 10 days of the stay with my old visa and would need a new visa for the remaining time. So for example lets assume our trip starts august 1. Then during our stay my old visa would be used up on august 10th, so a new one would have to start august 11th.
My question is if this is possible. My understanding is that you cannot hold two schengen visa for the same time horizon in parallel, but if they gave us a new visa starting 10 days after our intended start of the trip, this would be the case. If they give me a visa starting august 11 and for whatever reason we are not able to depart august 1 then in theory we would have two intersecting visa.
Also What would we need to put as the intended starting date of the trip on the application form? August 1 or 11? Obviously flight documents would be for august 1, but the new visa would start august 11