Offset+counta to autoselect data range for charting purposes

Hi community!

I have learned how to play with data ranges and define names for charts to automatically update them by using the formula offset + counta. An example would be: =OFFSET(Sheet1!$B$7,0,0,COUNTA(Sheet1!$B$6:$B$37)-1).

So, the problem comes when there is a need to select a data range which is not that well defined like $B$6:$B$37. So, I need to import data regularly into my workbook, this data will be imported right below of the last cell with values.

Now, how would I manage to automatically select the data range from this new import for my chart? See attached example. I have highlighted in Yellow a potential import... Please note there is no data in there so feel freel to fill it with any numbers you like.

I have tried to use a vlookup to find Country+Programme+Year (cat1 in the example) in the 'counta' part of the formula above. But I get lost,as a vlookup would retrieve a value and would not be useful for the data range?

Thanks a lot for your help! Really appreciate it.

All the best from my side to you all for Xmas time