Strategy URL API supports functionality to pass certain types of prompt answers. The below example shows how to pass source document selections as target document prompt answers with URL API:
http://<servername>:<port> /MicroStrategy/servlet/mstrWeb?
&Project=Strategy+Tutorial&Server=xxxxx&Port=0
&evt=2048001
&src=mstrWeb.2048001
&documentID=A773C5874B6730733115F59678CFBE4C
¤tViewMedia=1&visMode=0
&elementsPromptAnswers=8D679D3811D3E4981000E787EC6DE8A4;{&CurrentSelectionElementID:WA20F4F59CE534008867CA5B58A73A74A&},8D679D3711D3E4981000E787EC6DE8A4;{&CurrentSelectionElementID:W9E759260FDE34E85BBFAE41429C25272&}&share=1