Kostnadsstedet står i reiseregningen.

Because kostnadsstedet is the definite singular form of et kostnadssted.

• et kostnadssted = a cost center
• kostnadsstedet = the cost center

In Norwegian, the definite article is usually added to the end of the noun instead of being a separate word like the in English.

So:

• et hus = a house
• huset = the house

The same pattern is used here:

• et kostnadssted → kostnadsstedet

It is a compound noun, which is very common in Norwegian.

It is made up of:

• kostnad = cost
• sted = place

So kostnadssted literally means something like cost place, but in business language it means cost center.

A small detail: when nouns are joined together in Norwegian, they often get a linking -s-, which is why it becomes kostnads-sted rather than just kostnadsted.

Yes, stå literally means to stand, but in Norwegian it is also often used in the sense of:

• be written
• be stated
• appear
• be listed

So in this sentence, står does not mean that the cost center is physically standing somewhere. It means that the information appears in or is written in the travel expense report.

This use is very common in Norwegian. For example:

• Det står i boka. = It says so in the book.
• Navnet står på lista. = The name is on the list.

Using er would just say that something is, but står gives the more specific idea that the information is written down or listed somewhere.

Compare:

• Kostnadsstedet er i reiseregningen.
  This sounds more like the cost center is inside the travel expense report, which is less natural.

• Kostnadsstedet står i reiseregningen.
  This naturally means the cost center is written in / appears in the travel expense report.

So står is the idiomatic choice when talking about text or information appearing in a document.

In Norwegian, i is often used for something written in a document, especially when thinking of the document as containing information.

So:

• i reiseregningen = in the travel expense report

Norwegian sometimes uses på with papers, forms, lists, and surfaces, but i is very natural when referring to information contained in a document.

This is one of those areas where Norwegian and English do not always match word for word. English may say on the form or in the report, while Norwegian may choose i depending on how the document is viewed.

This is another compound noun in the definite singular form.

It is built from:

• reise = travel
• regning = bill / invoice / account / expense statement

So:

• en reiseregning = a travel expense report / travel claim
• reiseregningen = the travel expense report

The ending -en shows that regning is a noun of the en-word type.

This is normal Norwegian word order for a simple statement:

• Subject: Kostnadsstedet
• Verb: står
• Prepositional phrase: i reiseregningen

So it follows the common pattern:

Subject + verb + other information

This is similar to English:

• The cost center is listed in the travel expense report.

Nothing unusual is happening with the word order here.

Yes, grammatically you could, and it would mean something like The cost center can be found in the travel expense report. But it sounds a bit less natural if you specifically mean that it is written/listed there.

• står focuses on the fact that the information is written
• finnes focuses more on the fact that it exists / can be found

So in this sentence, står is usually the best choice.

Yes. Both nouns are in the definite singular form:

• kostnadsstedet = the cost center
• reiseregningen = the travel expense report

That means the sentence is referring to something specific, not just any cost center or any report.

If it were indefinite, it would look like this:

• Et kostnadssted står i en reiseregning.

But that would sound much less natural in most real situations.

If you wanted to talk about more than one cost center, you would use the plural form:

• Kostnadsstedene står i reiseregningen.
  = The cost centers are listed in the travel expense report.

Here:

• kostnadsstedene = the cost centers

The verb står stays the same, because Norwegian verbs do not change according to person or number the way English verbs sometimes do.

So:

• kostnadsstedet står
• kostnadsstedene står

The noun changes, but the verb does not.

Yes, it sounds quite administrative or business-like because of words like kostnadssted and reiseregning.

This is the kind of sentence you might see in:

• HR instructions
• accounting documents
• travel reimbursement guidelines
• internal company systems

The grammar itself is completely normal, but the vocabulary is more professional than everyday casual speech.