You can merge cells A1 and B1 into one 
my $format_header = $workbook->add_format(
   valign=>'vcenter',
    align=>'center'
);
$worksheet->merge_range('A1:B1','Header Text',$format_header);

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poj

In reply to Re: Possible to change a single cell width of an excel file by poj
in thread Possible to change a single cell width of an excel file by nutcr0cker

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