def create (cr, uid, vals, context=None)
#vals or values returns dictionary containing all the fields, so you can use it like this to assign new values
vals['field_name_1'] = new_value_1
vals['field_name_2'] = new_value_2

#or assign to a variable

var_1 = vals['field_name_1']
var_2 = vals['field_name_2']
return super(class_name, self).create(cr, uid, vals, context=context)

Hi,

def create(cr, uid, vals, context=None):
    if context is None:
        context = {}
    if vals.get('order_line'):
        #YOUR LOGIC#
return super(CLASS, self).create(cr, uid, vals, context=context)

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