In one enclosure
there could be more than one component (e.g. 74LS00). This typically refers
to electronic components where there could be several similar components
included in one enclosure (or device), e.g. several NAND gates on one
chip. If a component is selected, a window appears with the numbers of
components per enclosure. With the component 7400, the numbers from 1
to 4 are displayed, and with 7404 it would be the numbers 1 to 6. Every
number represents a group number. If you select a group (= number), all
pin names and numbers will be assigned automatically.
In the menu 'Automatic function-Automatic numbering' the distribution will automatically be done for the complete drawing set, with automatic assignment. If this is not desired, you should create only one Component/Enclosure with the 'Create Component' command. The single subcomponents of such a component, must not be placed on the same page, but may be placed on any other page in the drawing set.
The first group (first number) of a component must definitely be drawn (even if it does not have a direct function), because the Power pins (invisible) are only in the first group.