Freezing top x lines in a table

Bruno Baumgärtner <[email protected]>
Newsgroups gmane.comp.gnome.apps.gnumeric
Message-ID <[email protected]> 
Hello
I am in train to leave LibreOffice as this Methuselah is aeons to large for me. I 
need a simple calculation program to follow a few sales figures.

I have imported one of these files from Calc and all works well. But I can not 
freeze the first 6 lines like I do up to now. I am using Kubuntu 14-04 and will 
change to 18.04, the next LTS.

Could someone mail me the way, please. Would be much appreciated.

Extra question: Are you having a live chat group?
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