By using a proper relational model of your data. E.g. one table containing the list of computers, a second table containing a list of software, and a thrid, cross-reference table linking computer and software together for the inventory. nortmalize as necessary
Code:

COMPUTER_BASE
1=AAA
2=BBB

SOFTWARE_BASE
1=Software A
2=Software B

COMPUTER_SOFTWARE_XREF
1=1
1=2
1=2

Which means that computer AAA has software A&B whereas computer BBB has only software B.
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There are two types of vessels, submarines and targets.