I am trying to add a prefix number to a series of room numbers by level. I have the level number in a simple list, a sequence from 1 to 44. The room numbers are in a separate list of lists with each sublist being one level with a varying number of rooms. The value in Index  of List 1 matches all of the values in Index  of list 2.
When I use the List.Map function it adds the EACH prefix in List 1 to ALL values in List 2 rather than all the values of the matching index of List 2. This should be a relatively simple list management problem.
Questions that may or may not be related. Do i use List.LaceLongest/Shortest? What is a combinator?
Does Dynamo have the equivalent of Grasshopper’s graft function?
Is there a way to reference the ‘current index’ which is being mapped over?
Is there a way to capture and image of just a portion of the workspace (this should be a Dyanmo feature - had to old school screenshot)?