cv / new i.d. position issue

I am working in an international design studio and sometime ago i was promoted. However, eventually, for various reasons i do not plan to remain in that position for long (just few months).
When i leave the company, do you think that i should include this short-term position to my cv or to include this period of time to my prior position? I do know that possibly this higher position could place me to a better position to my new job and maybe a higher salary but juts being that position for 4 months more or less may also raise some questions.
Thanks for your time and suggestions.