Travelling out of country when H1b is filed

You can leave and return on H-4. COS will be considered abandoned and denied.

I am having a affair with a guy on Internet who is 15yrs younger then me and he lives outside the US, but i want to marry him.

You seem to have options - Fiance visa or immigrant visa petition

Can I apply for Opt ext and H1 at the same time with different employers?

I would not file multiple extensions for different status at the same time

I got a receipt number for my I539 application.

No

Applying for PERM in 6th year of H1B

Employee substitution is not permitted anymore.

The H-1B petition will most likely be rejected. Nunc pro tunc is for situations beyond your control. I don't see it helping your situation.

Working for US company from a foreign country

The question should be addressed to the company's attorney.

Can H1B which is under administrative processing be denied if H4 visa is applied?

Without knowing more on the reasons for administrative processing, it is difficult to suggest anything. If your husband will not be working for...

No EOS/COS stamped on I-94 visitor visa with 15 days entry period, what are my options to extend her stay in US

It will be in her interest to timely depart this time. With a good track record, she may be granted more time on her next trip. Having said that...

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I539 application to extend/change non immigrant status.

Is it for you or your spouse? If H-4 was filed along with H-1B, the receipt may be for the dependent's application. This is definitely not your...