Combine columns with corresponding names

Sorry, I should have been more clear. If you can select your column names using a wildcard with SelectColumns, then go with that. If not, you will want to get a list of your column names using ColumnNames. Then you can use List.Select to select items that meet your condition and then feed that list into Table.SelectColumns.

Solution: 

- First load the data source in an empty query and leave it. It functions as a source/staging query.

- create a list and filter the rows that you want like this: 

let
    Source = Source,
    #"step1" = Table.ColumnNames(Source),
    #"step2" = List.Select(#"step1", each Text.End(_, 21) = "Concurrent AudioCalls" or Text.End(_, 44) = "(PDH-CSV 4.0) (W. Europe Standard Time)(-60)")
in
    step2

This will give you a list with all columns that end with "concurrent audiocalls" and the correct timestamp (i have multiple timezones present). 

create a new empty query and use the staging query as source. Select the columns by using the list:

let
    Source = Source,
    #"Removed Other Columns" = Table.SelectColumns(Source, ListConcurrentAudioCalls)
in
    #"Removed Other Columns"

And now you can go on as usual :) 

Thanks to Smoupre for giving me this solution!