Rep A can let rep B view one of the Opportunities on the Account.

Rep A can let rep B edit all Opportunities on the Account

Rep A can let rep B view the Account but keep private Contacts.

Rep A can let rep B view the Account but keep private Activities.

A workflow on the opportunity

An assignment rule on the account

A trigger on the opportunity

An assignment rule on the opportunity

Enable chatter to have the lead sales representative facilitate collaboration through
sales team sharing

Define a sharing rule for each lead sales representative to assign appropriate access for
all extended team members

Configure default opportunity teams for all lead sales representatives with team selling
enabled

Create a public groups for extended team members and allow the sales representative
to assign manual sharing on their opportunities

Create a custom quote object to capture partner quotes on opportunities separate from
non-partner quotes.

Grant partner access to quotes and add the quotes related list to the partner opportunity
page layouts.

Update the partner sales process to include stages for managing and submitting partner
quotes.

Enable quotes and content in the Partner Communities to allow partners to store their
PDF quotes.

Build a Workflow rule to update the Opportunity Amount with a GrandTotal Value on the
Quote Record.

Add the Syncing checkbox to the Quotes related list.

Add a global action to sync the Quote with the Opportunity.

Add a Sync button to the Page Layout.

Build a formula field on Opportunity to roll up Total Value from the Quote Record.

Configure quotas with a product report and add necessary fields

Create a joined report with closed Opportunities, forecasting items, and quotas.

Create a custom report type with forecasting quotas and items.

Configure an analytic snapshot to capture the Opportunity forecast and quotas.

Add campaigns to opportunities when the campaign is related to a contact that is
assigned a contact role on the opportunity prior to the close date.

Have the administrator define rules for campaigns to automatically add opportunities
and then lock after 30 days.

Have the administrator specify a timeframe that limits the time a campaign can influence
an opportunity after the campaign first associated date and before the opportunity created
date.

Add child campaigns of the primary campaign source automatically if the child
campaigns have an end date that falls before the opportunity close date.

Have representatives populate a field on the opportunity record with the dollar amount of
expected revenue from the campaigns that influenced the opportunity.

Raise a case with Salesforce to enable Fast Loading of the related list of Invoices, as
this will help to render Account details faster.

Enable "Load Individual Component Separately" at the Lightning record page of the
Account object, as this will allow Account details to render while Invoice related list data will
be visible after querying details from Invoices.

Enable indexing on all the fields visible on the related list of Invoices, as this will allow
the related list to load faster.

Enable the "Separate Loading of Related Lists" setting from User Interface Settings, as
this will allow the Account detail to render while the Invoice related list data will be visible
after querying details from Invoices.