Google Sheets - Retrieve "A:File1" to "A:File2" where "Sheetname:File1" = "B:File2" if "C:File2" is between "E" and "F" in "File1" - import

Question

Sorry for the somewhat long title, but I was told to be as specific as possible. :D
My problem will require some explantion.
So, I have 2 spreadsheets files ("Konverteringstabeller" and "Tee Posen").
In "Tee Posen" I have a sheet named "Scores MIK" (golf scorecard and my name).
In "Konverteringstabeller" I have sheets with conversion tables for multiple golf courses, but if one works, all should.
What I need is to find out what course handicap I would get if my golf handicap is "HCP 26,0" (as shown in File 2 Picture), and in this case that result should be 29 (not visible), but you should get the point.
(example: golf hcp 10 would result in course hcp 11, because 10 is between 9,9-10,7)
While I have been able to find the right result, it has only been in the "Konverteringstabeller" spreadsheet file and that is not the place I need it.
I want to have it written in E6 in the "Scores MIK" sheet in File 2.
I should mention that in "Scores MIK : File 2", cell C2 (Ikast Golf Klub) has data validation so I can easily change between the different courses in the "Konverteringstabeller" file once I add more.
What I have been messing with is something with vlookup and importrange with concatenate in it, but I can't figure out how to do it, so I ask for your help.
And I am by no means skilled in the art of Spreadsheets, so I would very much appreciate a detailed explanation.
Picture - Scores MIK (File 2)
Picture - Ikast Golf Klub (File 1)
Thanks in advance!
// Mikkel Christensen

Answer 1

OK so a couple notes - One is that to join a static cell where you keep the sheet name but allow it to chance you should add '$' around it, also if the rows for B8-E70 will always be the same position on the various sheets you also need to add $ around those as well.
here is an example of the whole formula
=IFERROR(ARRAYFORMULA(VLOOKUP(E5:E25;IMPORTRANGE("spreadsheet key";"'"&C2&"'!$B$8:$E$70");4;TRUE)))
And lastly - using the "&" operator to concatenate is better at least in my opinion because concatenate sometimes does not work as well with array formula - plus I find it personally quicker and easier to use that having wrap yet another function around my stuff.