The CRM app provides a bunch of custom fields to connect the CRM entries to Jira issues. You should add those you'd like to use, configure them and add to the relevant screens (read: Adding a custom field (Atlassian documentation).
Read the particular custom field documentation to know about field configuration.
-
CRM Company -
CRM Contact -
CRM Property -
Contacts CRM -
CRM Products & Services -
CRM Custom Directory -
CRM Multiple Custom Directory -
CRM Select Custom Field -
CRM Issues Picker -
CRM Transactions -
CRM Companies Select -
CRM Products Select / CRM Single Product Select -
CRM Custom Company -
CRM UserPicker -
CRM Related list of Issues by JQL -
CRM Multi Select Related list of issues by JQL
The following fields use options and work similarly to the Select List type fields: CRM Select custom field, CRM Companies select field, CRM Company, CRM Contact, CRM Custom Directory, CRM Multiple Custom Directory, CRM Named Select Custom directory, CRM Products Select, CRM Single Product Select.
But unlike the Select List, you cannot enable/disable options within the list.