How do I select(fast) parts of long doc?

[suncat]

thanks for any help, I need to separate the house number from the street name
in a sheet that has 10,000 lines.

 

[Sheeloo]

Assuming your data is in Col A and house number and street names are
separated by a space then use this in B1
=LEFT(A1,FIND(" ",A1)-1) to get house no
and this in C1
=RIGHT(A1,LEN(A1)-FIND(" ",A1)) to get street name
and copy donw

 

[Stig - tame racing driver]

Just use text to columns (Data , text to columns) click delimited tick the
space box

Job done

 

[David Biddulph]

How many columns does the OP want the street name split into if it has
spaces in it?
I think I'd stick with Sheeloo's suggestion.