Where the Invoice Consolidation is 'Order by Order' on the "Customer Card", this means you want Business Central to produce 1 invoice per "Sales Order" so that if multiple "Posted Sales Shipments" have been created from it, ALL the shipments will be combined into 1 invoice.

Opening up a "Sales Order" for the Customer you have this set up for, create the order as usual, including the Items you wish to sell. Firstly, there are no limitations to the user with regards to invoicing this manually, so for example should you need to create an 'on the fly' invoice outside of the Scheduled Invoicing setup, the User can still press Post in the ribbon and use the 'Ship and Invoice' or 'Invoice' options. Doing this will still update the Last Invoiced Date on the "Customer Card" to 'Todays' date, therefore any scheduling now uses 'Today' as the start date for the next invoice being raised. 

Secondly, if you do want to run the create invoice functionality using the Scheduling provided, in the search bar, find "sales order invoicing" which will open up the request page below. Here, you can choose what you want to schedule, so in the below example I have just selected 1 customer to run as a batch. This example would then look at all the "Sales Orders" for the Customer '10000' and create the Invoice for any "Sales Orders" that have "Posted Sales Shipments", so long as the Last Invoiced Date + the Invoice Frequency Date was had been reached. 

You can choose to run this now or click on the Schedule option above to set up recurrence on a Job Queue. This means this process does not need to be repeated manually, rather Business Central can use the recurrence you setup in the "Job Queue Entries card" to then run a check to see if the Last Invoiced Date + Invoice Frequency = 'Today'. Where it is, your Invoice(s) will be created and the Last Invoiced Date will automatically update with 'Today's' date. Where the calculation has not been reached, the check will be done again on the next date you have setup recurrence and the Last Invoiced Date will remain as it was with no change. 

The "Posted Sales Invoice" uses the Get Shipment Lines functionality to draw out the relevant lines to include, which will appear on the invoice as per below image.