Step 1:
Create a Per-Invoice Regular Workflow. This will be email only reminders.
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​Step 2:
Move the entire Account to the Per-Invoice Workflow
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A)In the Accounts view, select the tick box next to the Account you wish to move
B)Select the Change Collector option
C)Select the Invoice-Only Workflow created
D)Click Change
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​This Account now has all invoices in a Per Invoice Workflow.
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From here there are 2 options:

1- Leave this account in Per Invoice reminders. They will receive a reminder email for each invoice in the workflow as created. You can choose to pause specific invoices.
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​You will need to update the Contact for this Account to have the Per Invoice Regular Workflow as their default to ensure new invoices are added to this workflow.
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2- Move selected invoices back to the Smart Workflow. This will result in specific invoices being Per Invoice Workflow reminders, and all new invoices being added to the Default Smart Workflow which sends out reminders as an Account.
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​Move Individual Invoices back to the Smart Workflow
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A)in the Accounts view, select the tick box next to the invoices for the Account you wish to move to the Smart Workflow
B)Select the Change Collector option
C)Select the Smart Workflow required
D)Click Change
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You can now see that this Account has different workflows attached:

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