Here's a simple example of creating a manufacturing order in GP. This will give you an idea of how the process works.
You will need two things in order to create a manufacturing order transaction:
1.) Bill of Material (See my example of simple BOM) For this example make the BOM a "Backflush" BOM
2.) Routing
Let's make the routing first. Create a simple one that has one sequence. Navigate to: Cards >> >> Manufacturing >> >> Routings >> >> Routing Entry.
Look up your finished good item number.
Create a Routing Name.
When the Routing Header Creation screen comes up, check, "Primary Routing" and save.
Enter "100" for the sequence number.
Select a work center. If you don't have any, they're simple to create.
Save, and you're done.
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Create a Manufacturing Order Transaction.
Navigate to: Transactions >> >> Manufacturing >> >> Manufacturing Orders >> >> Entry
Look up your finished good item.
Create a default Scheduling Preference if you don't have one.
Enter an Ending Quantity amount.
Assuming a "Forward Infinite" Scheduling Method, enter a "Start Date".
Click on "Schedule MO" button.
Click on "Build Picklist" button.
You are done entering the manufacturing order transaction.
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To proceed, change the "MO Status" field to, "Released", and save.
Create a Manufacturing Order Receipt transaction to add the finished good item and relieve the component items from inventory.
Navigate to: Transactions >> >> Manufacturing >> >> Manufacturing Orders >> >> Entry
Look up your manufacturing order, and enter the quantity of the finished good created.
The Quick MO offers an alternative to the Manufacturing Order, but I like this best, and don't feel it's much more complicated than the Quick MO.
Try this out in the Fabrikam sample company, and you'll see that basically, it's fairly straight forward.
There are significantly more options and functionality, but this will help you get over the initial feeling of being overwhelmed.