Hou die afleweringsnota ingeval die kliëntediens daarvoor vra.

Because this is a command or instruction. In Afrikaans, as in English, the subject is often omitted in the imperative.

• Hou ... = Keep ...
• An explicit jy would usually sound unnecessary here.

So Hou die afleweringsnota ... is the natural way to say Keep the delivery note ...

Here hou means keep or hold on to.

That is a very common meaning of hou in Afrikaans:

• Hou dit veilig. = Keep it safe.
• Hou die kwitansie. = Keep the receipt.

Be careful, because hou van means like/love, but that is a different structure:

• Ek hou van koffie. = I like coffee.

In your sentence, hou simply means keep.

Because die here means the. The sentence is referring to a specific document: the delivery note.

So:

• die afleweringsnota = the delivery note

Afrikaans uses die as the definite article for both singular and plural nouns:

• die boek = the book
• die boeke = the books

Afrikaans very often forms compound nouns by writing them as one word.

afleweringsnota is made up of:

• aflewering = delivery
• nota = note

Together:

• afleweringsnota = delivery note

The -s- in the middle is a linking element that often appears in compounds. English usually writes these as separate words more often, but Afrikaans prefers one combined word.

Ingeval means in case.

So:

• ingeval die kliëntediens daarvoor vra = in case customer service asks for it

It is not exactly the same as as:

• as = if
• ingeval = in case

They can sometimes overlap in meaning, but ingeval specifically expresses precaution: do this now because something may happen later.

Because ingeval introduces a subordinate clause, and in Afrikaans subordinate clauses usually send the conjugated verb to the end.

Main clause:

• Hou die afleweringsnota.

Subordinate clause:

• ingeval die kliëntediens daarvoor vra

So the pattern is:

• ingeval
  • subject + other information + verb

That is why you get:

• ingeval die kliëntediens daarvoor vra not
• ingeval die kliëntediens vra daarvoor

Here daarvoor means for it.

In this sentence, it refers back to die afleweringsnota:

• daarvoor vra = ask for it

Afrikaans often uses these pronominal adverbs:

• daarvoor = for it / for that
• daarvan = of it / of that
• daarmee = with it / with that

This is often more natural in Afrikaans than using a separate pronoun after a preposition.

Because when Afrikaans uses a preposition such as vir, it often combines it with daar- to make a more natural expression:

• daarvoor = for it

So:

• vir die afleweringsnota vra = ask for the delivery note
• daarvoor vra = ask for it

This works similarly to Dutch-style structures and is extremely common in Afrikaans. A learner should get used to forms like daarvoor, daarmee, daaroor, and so on.

Kliëntediens means customer service.

It is another compound noun:

• kliënt = client/customer
• diens = service

Together:

• kliëntediens = customer service

Again, Afrikaans usually writes these compounds as one word.

The two dots in kliënt are a diaeresis. They show that the vowels are pronounced separately.

So kliënt is not pronounced as one smooth vowel group; the marking helps show that the i and e belong to different syllables.

This kind of spelling mark appears in some Afrikaans words to guide pronunciation and syllable division.

It can mean both, depending on context.

In this sentence, daarvoor vra means:

• ask for it
• or more naturally in context, request it

So vra is a flexible verb:

• Ek vra 'n vraag. = I ask a question.
• Hulle vra hulp. = They ask for help.
• Die kliëntediens vra daarvoor. = Customer service asks for it / requests it.

Yes. A very natural English translation would be:

• Keep the delivery note in case customer service asks for it.

A more literal breakdown would be:

• Hou = Keep
• die afleweringsnota = the delivery note
• ingeval = in case
• die kliëntediens = customer service
• daarvoor = for it
• vra = asks

So the Afrikaans structure is slightly different from English, but the overall meaning is very straightforward.