Automatically removing header segments from the existing LVM file

Hello,

I have a LVM file containing sampled data of two channels (sampled at a the same rate of 100Hz) without x values(time) with many header segments.I wonder is it possible

1) to change automatically (not manually because it contians so many header segements) the LVM file such that it contains only first header while removing all other header segments.

2) how to add x(time) values to the existing LVM file

Thanks.