You can create an Invoice for ONE Matter and choose exactly which of the the specific billings to use in the invoice. If you do not want to choose which billings (you know all billings are okay) SEE: Quick Create One Invoice ~ Matter TAB / 'Batch Invoice' button ~ Automatic Billing Choice
Navigate to the Matter Tab

Choose a Matter

Choose the Name of the matter
Click 'Create Invoice' Button

Set the Date Range for the Invoice

Select Billings to use in the Invoice

1. Choose which billings to include in the invoice
2. Click 'Create Invoice' button
Add Fund Account Options

If you wish to make a fund Account Payment st this time - Choose either Retainer or Trust from the Type drop-down menu. This will add a payment and Click Yes
~OR~
If you do not wish to make a fund Account Payment st this time - Click NO
Invoice Creation Notification

Click OK