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There are two salary matters here, one is for H-1B and one on LC for GC. The two may or may not be same, if your current position for H1 may be some kind of different as the one you will be hired for after GC approval for instance, but both need to match or over the minimum reqirements.
Assuming your salary is reduced but still over the prevailing salary required for your current H-1 position. You have no problem right now. Otherwise, you are required by law to transfer/reapply for a new H-1 that is good for the position with reduced salary to keep you on a valid H-1. (Normally the position is called a new position if the salary for the position was reduced)
But as for the salasy required on LC/140 of GC, don\'t be confused, that is about the salary for position you are promised to be hired for in future once your GC is approved. You current salary does not have to match it. Morefurther, even the current reduced salary does not have to be mentioned on the letter for 485 if it is slow. Talk to your atterney and explain to your employer the detailed difference. If they still would keep the promise of the salary offered you on LC and would like make it once your GC approved, they can legally write the salary on the letter for 485, instead of your current reduced salary. So, you have no problem with your 485. Otherwise if they don\'t want keep the promise of the salary on LC, and reduce the promised salary that they would pay after your GC approval. They have to write that reduced salary on the letter for 485. Then you have a big chance to get a RFE about your salary later.
For your information only, check with your atterney for sure. Good luck.