Using cell value as an function argument

[eurano]

Hi!
What im trying to do is to replace red marked part of the forumula with value from orange cell (look @ screenshot). Value in that cell is a result of CONCATENATE formula and its result is dynamic. I will appreaciate any help.
screen = https://postimg.org/image/vqvai5wip/

 

[RoryA]

It looks like you want the INDIRECT function, though I'm not sure what it would be called in your version.