Hello,
I have to add a custom item menu under "my pipeline" . it will be reponsible to show a list of activities for every client related to one opportunity . So, when clicking, it will append a tree view with button create that create an activity related to one opportunity for a specific client. i will be very thankfull if someone give me a little help.
HI, for creating a module you can refer this link ,
https://www.odoo.com/documentation/10.0/howtos/backend.html .