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Does anyone have any examples of curve fitting I can study?

The sort of problem I have is a measured curve consisting of a weighted sum of portions of other curves A, B. C,.....

I want to fit curves A, B, C,.... to the measured curve... to determine the proportions of A, B, C, ... nneded to model it.

I am completely stuck as how to formulate this, should I be using the lsfit routines? if so can sopmeone give a pointer as how to set up a problem of this type

many thanks in anticipation of some pointers,

You should use linear least squares - this algorithm represents data as linear combination of arbitrary functions (even nonlinear) assuming that you know function values in points of dataset.

lsfitlinear function, I think, should work for you.