form generateId id

Hallo Joget Expert,

i have question and  please answer

i have 3 form

1. login
   custom:
           generateId
           customHtml
2. start
   basic:
           Textfield : name
           Textfield : age
3. requirements
   custom:
             customHtml
   
   My question is
   
   in all form, i already generate crud. 
   when I click save in form login, it will create id, generateId and another field.
   
   I want if i click save in form start and requirement s
   i need bring the id or generateId in form login to form start and requirements
   
   how can i do that ?
   please help
   
   
   the way I've tried
   
   make forms in same table 
   but in every form i have save button, so if i click all forms it will create 3 data , in every form
   
   join table
   im not sure what im doing is right 
   in table start i join with login , and when i create the new data its not shows in start list