Hi,

its jacob i need formulas or macros which ever to do the following

firstly timber in lengths are purchased in 300mm calcualtions example 300,
600, 900, 1200 and so on up to 5.400 mm which is 5.4 meters

Now i am a builder and i am trying to set up a work sheet to calcuate the
architraves around many windows in a house these are the timbers that cover
around a window internally So in saying this i need two sets of formulas

Formula 1. to calculate each piece upwards to the nearest 300mm for example
if it is 2048mm then should be 2100mm and so on


Formula 2. once i have many windows which would have 4 pieces of wood to
each i need to then quickly calculate the the totall quantities to place the
order to the timber suppliers


ie/ i could have 12@ 2400 32@ 1200 and so on so i need a formula which would
clacuate all the same lenghts and quantities of lengths to place order


Thank You jacob