How to Fetch table datas to another table and disply in drop down menu

Hi! I need a Help, Am new to this

This Doctype name is value:
Now, after clicking on the save button this will get redirecting to another Doctype name called Redirecting on that doctype there is a table called table_2. So, when it’s get redirected I need this value to be there on Redirecting doctype table_2 like drop down menu.
the below table data i need in Redirecting doctype table_2.

this is redirecting doctype the data which need in drop down menu hear.

This is redirecting Doctype:

this is value Doctype:

This is my child table where the value getting store in value doctype:

Thank you.