For most Managed Service Providers (MSPs), time is literally money.

But when your services are billed by the hour and your pricing varies based on clients, contracts, or rate cards, managing sales orders and invoicing can quickly become chaotic.

One of our MSP clients came to us with exactly that pain. Their manual process was error-prone, time-consuming, and difficult to audit.

Let’s explore our solution- Automated Timesheet Billing in Odoo.

How does Timesheet Billing work for an MSP or similar business niches?

Let’s understand the operational challenges the MSP faced due to lack of timesheet & invoicing link.

This MSP had a common but tricky use case, they offered ad-hoc support and consulting billed hourly. But the unit price wasn’t one-size-fits-all:

• Some customers had special weekly rates tied to their contracts.
• Others followed standard price lists but engaged senior-level engineers whose rates differed from normal ones.
• In some cases, the rate had to be entered manually to offer discount or include weekend hours.

And while they tracked actual hours in timesheets, those entries didn’t automatically flow into sales orders or invoices. This meant their team spent hours every month:

• Manually checking which rate to apply
• Calculating totals for each client
• Creating and sending invoices
• And praying nothing slipped through the cracks

Now, let’s understand the workflow of this Automated Timesheet Billing solution:

We configured a tailored workflow in Odoo using Sales, Timesheets, and Invoicing apps with custom logic layered in to ensure the system always knew how to calculate totals.

Here’s what we delivered:

Smart Sales Order Calculation

Odoo was customized to apply a pricing hierarchy automatically when creating Sales Orders for timesheet-based services:

1. Customer-Specific Weekly Rate – If defined, this rate was prioritized and multiplied by the delivered quantity.
2. Pricelist Rate – If the customer had a valid pricelist for that service, it overrode the weekly rate.
3. Manual Entry – If neither existed, users could input the rate directly.

Every sales order line would automatically reflect:

• The correct unit price
• The total amount (based on actual timesheet hours)
• A clear audit trail of how that price was determined

This timesheet billing method removed ambiguity, reduced pricing disputes, and ensured consistency across the board.

Automated Invoice Generation from Timesheet Billing Hours in Odoo

Once the timesheet billing hours were logged via timesheets, Odoo took over. Invoices were auto-generated on a scheduled cadence (e.g., monthly), and the system ensured:

• Only unbilled hours were billed
• Unit prices matched those on the originating Sales Order
• Quantities were calculated as the difference between new hours and previously invoiced hours

The result? Invoices were sent out faster, with zero manual calculation and total confidence in the numbers.

The Result: Full Visibility + Faster Cash Flow

Here’s what the MSP saw after implementation:

• 90% reduction in invoicing time
• No more hunting for correct pricing
• Crystal-clear totals in list views for both Sales Orders and Invoices
• A full audit trail showing which rate was applied and why

Most importantly, their team could trust that invoices reflected the actual work done, without anyone needing to double-check spreadsheets or chase down data.

If you’re an MSP still wrangling spreadsheets or manually building invoices from timesheets, you’re leaving time and money on the table. Odoo, when set up with the right logic, doesn’t just simplify billing. It eliminates stress, boosts accuracy, and accelerates your cash flow.

And your team? They get back hours every month to focus on service delivery, not administrative overhead.

Want to see what a smarter & automated timesheet billing looks like for your business? Let’s talk.