How can I add the existing accounts to a campaign?
You can add the existing accounts to a campaign by following the steps given below:
Create a Lookup field for Accounts. A Related List will also be created for the Campaigns.
Label: Campaign Source (This field will be available for Accounts) Lookup Type: Campaigns (You will be able to select campaign records from the lookup field) Related List Label: Accounts (A Related List will be created for Campaigns)