Hi,
1/ "substr" function remove characters. So by growing the values, you would displayed less characters.
2/ I do not understand your question
3/ A column headers ?!
I think you want to use some "order custom fields" for your "posted, carrier, collect, first class" information.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.