In expense@work you can control the availability of Expense Types for selection on Forms.
This article summarises the different ways that this can be controlled.
Typically the availability of Expense Types on a form is controlled in System Parameters on the Expense Type tab.
By default all Expense Types are available on all forms but if you elect to filter expense types then Every New Expense Type needs to be explicitly enabled by moving it from the Left hand side to the right hand side.
In certain implementations Expense Type availability can also be restricted using the Expense Types tab on the Companies record, Form Types record and Employee Record.