Is my work as a quality manager in a lighting product assembly company, which sometimes involves removing the original country of origin and replacing it with another at the manager's request, permissible in Islamic law? And is the salary I receive lawful, especially since I only conduct tests and review data, and I have significant family obligations?

Changing the country of manufacture is a lie and deception. The product tests do not justify selling it as a local product; rather, the country of origin must be stated.

It is not permissible for the questioner to directly engage in this deception by changing the country of manufacture.

As for conducting tests and permissible activities, there is no harm in that.

If the questioner can limit himself to what is permissible and avoid what is forbidden, there is no harm in him remaining [in the job] while continuing to advise.