I-797C received for L2 indicating class as H4, does this mean H1 is approved ?

the L2 to H4 gives one hope. but, nothing you can count on. have your employer check a canceled check for the filing fees.

Can I go to Europe 4 one month. 4 my daughters wedding, while I have applied for my renewal.How long does renewal take?

the green card renewal takes about 10 months. you must be present in the US for the biometrics which follows 2-3 months after filing the I-90.

H1b and extension

with the I-140 a 3 year extension of your H1B may be obtained.

1. Will the work status (unemployed) jeopardize my H1B approval? 2. Is it possible to do the H1B transfer before Oct 1st?

1) unemployment with the sponsoring company could cause a denial for no employment offered; since, it is a cap case an approval petition only...

What is latest date by which I should file for L1A, i.e., 6months prior to I94 expiry OR 6months prior to 5years max out?

6 years prior to 5 year max out. Don't wait. Fai Dee. Macht Schnell. Pronto. Bali.

Should I change my address while my I-485 is pending or wait till it's done?

You are required by law to update your address. Failure to do so is a basis for denial. The change in jurisdiction will result in a 3-4 month delay.

the MANVI program provides a fast track to US citizenship after boot camp.

Since I have two legal H1B Receipts, Can I work full time with both employers ( A & B). I will get two pay checks & two W-2's.

There is a USCIS memo that state where there is a change of employer filed and the prior employer does not withdraw the employment you may return...

Possible to get H4 if I-485 declined .

If you are the spouse of person in H1B status and you are in status you may submit an H4 change of status. If you are D/S but out of status you...

1. Given that if employer Y gets my petition transferred and approved,Can I travel to USA with my X visa and Y petition copy ?

assuming y petition is approved you may travel to the US with x visa and y approval.