Instead of modifying existing views in place, Odoo provides view inheritance where children “extension” views are applied on top of root views and can add or remove content from their parents. An extension view references its parent using the inherit_id field, and instead of a single view, its arch field is composed of any number of XPath elements selecting and altering the content of their parent view.

1. View Inheritance
in Odoo 15
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2. INTRODUCTION
 Instead of modifying existing views in place , Odoo provides view inheritance where
children “extension” views are applied on top of root views, and can add or remove content
from their parent.
 An extension view references its parent using the inherit_id field, and instead of a single
view its arch field is composed of any number of xpath elements selecting and altering the
content of their parent view.

3. First of all we have to inherit a model in the python code and add a particular field

4. Then add that field into the xml file

5. To display that fields we have used xpath expression. In "expr" attribute we used
"//field[@name='function']" and "position="after"", its mean that place our newly created field after
name field of parent form view. Position attribute have following values.
1. position="after" : To display field after parent form view field mentioned in "expr"
2. position="before" : To display field before parent form view field mentioned in "expr"
3. position="inside" : To display field inside notebook of parent form view
4. position="attributes" : To change field attribute such as read only and visibility of a field
5. position="replace" : To replace parent form view field with your newly created field

6. On the form view of contacts we can see the DOB field

7. For More
Details
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View Inheritance in Odoo 15

9. Thank You