How can I Configure Dashboard section for new custom doctype

I created a new custom doctype called Memo. I like to create a dashboard section just like the one in Purchase Order. How can I go about it. I need your Help. the image below is what I want to create

If you’re on v13 or develop, you should have a Links section in the doctype where you can configure this.

i’m using version erpnext version 12

how can I configure the dashboard with V12. please i really need help