Hey i have a custom module which i have embed into maintenance. There i create roles lets say i have "mason" in occupation and in  line view i add five lines relationg to masons works. Now that is a Char field. What i want is that in my maintenance request when i select mason from a field i want another field which must show all the values in line so that i be able to select one of them based on the nature of work. I dont want to use selection fields here, 

This is how i am getting data from that model

occupation = fields.Many2one('my.model', string ='Trade')
​

But how to make a field which must fetch all the lines related to the occupation selected.

Thanks in advance