Design a simple Model with GAMS general algebraic system - 2nd try

I am a beekeeper in Austria and for research I have to work with GAMS general algebraic modelling system. I need a small model as to what to do with the bees ( produce honey, sell other stuff from them while taking into account the costs per hour/beehive ... data will be provided as excel sheet! ). I have a sample GAMS sheet available ( a different model) which will give you an idea what it should look like! It has to be done in GAMS !! If you are familiar in GAMS it should take not long. If you don't know GAMS please refrain from bidding - as my last "partner" promised to design the model but didn`t succeed. Please don't ask implausible sums as it is only a workload for a few hours!!