You must create an order of type "Schedule" (and not "Monthly") in order to define the deadlines agreed with the client AND no longer invoice the monthly consumption observed on the project.
From the project order card:
To create the deadlines, click on "+ Create a schedule". You can then define several criteria according to your needs:
Frequency
Monthly, quarterly, semi-annual, annual or customCalculation method for the amount of deadlines to apply
You can choose to apply an amount or a % of the ordered turnover, or manually enter the amount for each deadlineDeadline date
For a regular frequency (not custom), you can choose when in the period the deadline should be set (e.g.: last day of the month for a monthly period)Number of deadlines
For a custom frequency, you can choose the number of planned deadlinesDescription of deadlines
You can manually enter this description, or use the available dynamic variables
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Important
You can configure a default configuration for your schedules in Administration, and thus define the frequency, amount, description templates by default that you wish to use.
Administration > Global Settings > Billing tab > Schedule settings
To manage the billing for these deadlines, I invite you to consult these online guides:
Schedule billing