I try to find the best way to apply the following process:
I have created a relationship lines -orders-quotation. what could be the best approach to built this data entry process in BOARD?
The ato object should answer your need. Using an ATO (either as object or within a dataview) allow you to insert new members in your entities Lines, Quotations, Orders and relate them within the hiearchy.
According to you needs, you can
Be aware that this is a sensible operation, and an end user can not rename a member code (DB developers can) if he tipped it wrong. he can only modify an entity member description.
More content here:
Configuring ATO (option 2 of my message)
DataView in ATO (option 1 of my message)
Retrieving data ...