Hi Sherlin,
In a microflow, you can use a change object activity. On the $Ticket/Applications attribute, use something like this if/else statement.
It's even better to model it out the Mendix way, using a split. Just use $Ticket/Category as input and follow the ‘Hardware’ flow from it.
If getCaption($Ticket/Category) = 'Hardware'
then
module.enum_category.emptystring
else $Ticket/Applications
A couple of tips: