Users with certain access rights can create and edit a travel-policy and define it for employees.

You can create a travel-policy for airline tickets, train tickets, and stays.
You can create different rules for different employees, depending on their position or other criteria.

Policy, which is defined by default, will apply to all employees of the company. If a different travel policy is defined for a department or employee, then it will take precedence.

Rules, that you can customise are incredibly flexible and will suit any level of requirement.
Rule blocks can be combined with each other, included together or separately.

We will tell you what rules you can set up for air tickets:

Allowed booking classes - allows you to limit the available classes
Connections - allows you to limit the maximum number of flight connections
Flight duration - allows you to limit the maximum flight time from takeoff to landing
Forbidden flight numbers - you can ban flights by a certain airline in general or a specific flight
Departure time - limit the departure time before or after the specified time
Banned countries and cities - you can restrict the flight to the country and introduce exceptions for certain cities
Timeliness of purchase - sets the minimum number of days before departure from the moment of registration
Booking classes and routes - restriction on classes, depending on the duration of the flight to destinations
Deviation from the minimum price - you can set the allowable deviation in percentage or a fixed amount
Route limits - set limits for certain routes
Prohibited days of the week - specify which days of the week you cannot fly
Type of air travel - ban on round-trip or one-way tickets
Traveling with Baggage - You Can Ban Baggage or Baggage Fares
Fare groups - limits the ability to issue tickets for expensive subclasses

We will tell you what rules you can set up for Train tickets:

Allowed train types - allows you to restrict branded and other trains
Allowed categories of seats - you can prohibit business or other categories of seats
Timeliness of purchase - sets the minimum number of days before departure from the moment of registration
Journey duration - limit on the duration of travel by train
Restrictions by directions - you can set the allowable deviation as a percentage or a fixed amount
Travel cost limit - set limits on certain routes
Prohibited days of the week - specify on which days of the week you can not go on a trip

We will tell you what rules you can set up for Stays:

Timeliness of purchase - sets the minimum number of days before check-in from the moment of registration
Banned hotels - you can ban countries, cities or specific hotels
Limits by destinations - you can set the maximum cost per night in different locations
Hotel star rating - set limits on hotel star rating
Prohibition of rooms with and without meals - you can prohibit rates with or without meals
Prohibited days of the week - you can prohibit certain days of the week from staying at the hotel

Travel-policy can be assigned to each employee in his profile, assigned to a department, and set to be unified for the entire company.

Ascending priority is as follows - default policy, department policy, employee policy.

When searching for services, you will see TP icons in each of the options found when searching for flights, train tickets or stays:

Green icon - travel policy is not violated
Red icon - travel policy violated

When you hover over the icon, you will see what exactly is violated. Even a variant with a violation can be booked, but it's registration may require approval, it all depends on the settings of the approval scheme.