brotherton-erpnext/erpnext/docs/user/manual/en/customize-erpnext/articles/creating-custom-link-field.md

#Creating Custom Link Fields

Links field are the ones linked to another document type. For example, customer field is a link field in Sales Order. This field is linked to the Customer master.

You can insert Custom Link Field by following steps below.

####Step 1: Go to Customize Form

Setup > Customize > Customize Form

####Step 2: Select Form

In Customize Form, select Document Type (Quotation, Sales Order, Purchase Invoice Item etc.). Once fields are updated in the accompanying table below, open a field above the one you wish to insert your Custom Field. Then click on "Insert Above" to insert the new Custom Field.

####Step 4: Custom Field Values

To set field as Link, enter values as below.

1. Label: Desired label that user wishes to display in the form.
2. Type: Set as 'Link'
3. Name: Desired name for the field
4. Options: Enter the name of the Doctype to which the field is linked