بما ان خبير المعاينة سلم تقرير الضرر، الشركة هتراجع رقم المطالبة.

It means since / given that / now that. It introduces the reason or background for what follows.

In more careful spelling, many people would write بما إن. In everyday writing, بما ان is very common too.

It’s a mix of Egyptian and formal/business Arabic, which is very normal.

• هتراجع is clearly Egyptian because of the future marker هـ
• خبير المعاينة
• تقرير الضرر
• رقم المطالبة

These nouns sound more formal or technical, which fits an insurance context.

So this is the kind of Arabic you often hear in real life: Egyptian grammar with formal vocabulary.

Because Egyptian Arabic often likes subject + verb order in everyday speech, especially when the subject is a full noun phrase.

So:

• خبير المعاينة سلم تقرير الضرر

is a natural way to say:

• the inspection expert submitted the damage report

Arabic can also use verb-first order, but this subject-first order is very common in spoken Egyptian.

Literally, it means the inspection expert.

In an insurance context, it usually refers to someone like:

• an inspector
• an appraiser
• a surveyor
• a claims assessor

The exact English title depends on the system or company, but the general idea is the person who checks the damage and reports on it.

Here سلم means submitted / handed over / delivered.

In paperwork or office contexts, سلم often means:

• to submit a report
• to hand in documents
• to deliver something officially

So it does not necessarily mean a literal hand-to-hand passing only; it can also mean formal submission.

Yes, they come from the same root, but the meaning here is different.

• رجع = to return / come back
• راجع = to review / check / go over

So in this sentence:

• الشركة هتراجع رقم المطالبة

means:

• the company will review the claim number

not the company will return the claim number.

This is a very common thing for learners to notice, because the root is familiar but the verb form changes the meaning.

Because الشركة is grammatically feminine singular.

In Arabic, nouns like شركة usually take feminine agreement, so the present-tense form is:

• تراجع = she/it reviews

Then Egyptian adds هـ for the future:

• هتراجع = she/it will review

So the verb matches the grammatical gender of الشركة, not natural gender.

It marks the future in Egyptian Arabic.

• تراجع = reviews / is reviewing
• هتراجع = will review

This هـ is one of the most common future markers in Egyptian Arabic.

Compare:

• Egyptian: هتراجع
• MSA: ستراجع or سوف تراجع

Literally it means the number of the claim, or more naturally in English, the claim number.

• رقم = number
• المطالبة = the claim

In insurance language, this usually means the claim’s reference number or file number.

Because رقم المطالبة is more specific.

• المطالبة = the claim itself
• رقم المطالبة = the claim number / claim reference

In administrative and insurance language, this kind of precision is very common.

Because بما ان already connects the first clause to the second one logically.

The structure is basically:

• Since X happened, Y will happen.

So the comma simply separates:

1. the reason/background
2. the main result

That is very natural in Arabic writing.

Yes, in everyday writing it’s very normal.

A more careful spelling would often be:

• بما إن

But many people write:

• بما ان

especially in informal or practical writing. So the spelling in your sentence is common and understandable, even if it is not the most formal version.