VB6 - Transfer from MSHFlexgrid to another

Hi,
I need your help for what I would like to do bellow.

In my MSHFlexgrid1, I may have a huge volume of rows and columns. But in column 9, I have IDs.
What I need to do is to transfer in MSHFlexxrid3 all rows and columns. But every time a value will show in column 9 that match column 0 from MSHFlexgrid2, when it will transfer into MSHFlexgrid3, it needs to change the value from column 9 only with the SUB_ID in column 1 from MSHFlexgrid2. All the other details must stay the same. So far, this is not a problem.

Where it gets more complicated is if a single value from column 9 may show more than once in column 0 from MSHFlexgrid2. When that happens, it must be clone into a new row so that both SUB_ID are transfer in MSHFlexgrid3. If I have 3 match, then it should clone it 3 times with each SUB_IDs.

Example:

The value 12 shows twice in MSHFlexgrid2 with 2 different SUB_IDs. So it needs to create a record of each like below:

ow can i do that?

Thank you for your help.