Enter the part number and description and ensure the 'Type' is "Assembly/SubAssembly" - see the image above.
miniMrp now includes a new type of assembly "CSAS (Closed Sub Assembly)". Use this type if you're creating a record for a sub assembly that is generally produced and held in inventory in advance of requirement.
In versions 2 and 3 of miniMrp the category could only be "AS" for assemblies. In this version you can use/create any category name.
Click the 'Save' button and exit.
Now that you have an assembly you can use the Parts List Editor to create a parts list.
Select 'Assemblies' from the main menu and miniMrp displays a list of all assemblies in your database - see below.
note: The image below is version 4.0/4.1 If you are already using the new v4.2 then your menu will contain a separate Assemblies menu but the process described below is the same.