Arado made several proposals for various 'Mistel' composite aircraft, the first in September 1944 for an Arado 234 upper, piloted component and a purpose built lower component given the designation E 377. This came to nothing, the project was abandoned in February 1945 before any prototypes were built..
The proposal for a Fi 103(V-1) mounted above an Arado 234 was named 'Huckepack' and dates from October 1944. Air launched V-1s had been used against Britain in the second half of 1944, launched by the He 111s of KG 3 and KG 53. The Arado 234 was seen as a much more effective means of launching the attacks and evading the RAF's fighters. The Fi 103 was to be raised clear of the Arado for launch using a hydraulic system but how this was to operate is not known. The project never got beyond the conceptual design phase.
The Mistel concept really caught on in Germany late in the war. Fiesler proposed another composite with and Fi 103 (V-1) attached below a Fw 190 A-8, the whole ensemble would take off from a specially designed trolley.This too never got off the paper it was proposed on.
Cheers
Steve