Unfortunately, it is currently not yet possible to ticket custom fields. This has been asked by our customers before and is currently on our customer wish list. We have tagged this Forum topic as a feature request to add weight to this. Do note, that we are unable to provide you with an estimated release date for when it might be implemented in Lansweeper.
Alternatively, you can create templates for your tickets whenever a user asks a question and include a button in your Text editor to add knowledge base links. Enabling this option can be done under Configuration\General Settings in the General section. More information on creating ticket templates can be found in
this knowledge base article.