copy across formula while skipping columns

I'm trying to write a macro that will:

1) select a range of cells within the same row - where the first cell
in the range contains a formula with a link to another cell

2)macro copies the formula from the first cell in the range and pastes
it into the remaining cells in the selected range, while skipping a
user defined number of columns

before macro:

A B C D E F G
1 10
2
3 10 20 30 40

after macro:

A B C D E F G
1 10 20 30 40
2
3 10 20 30 40

the formula in A1 is =A3. I'd like to be able to select A1:G1 and run
the macro so that C1 refers to B3, E1 refers to C3, etc. I'd like
this to also work where the formula contains a combination of one or
more links and/or arithmetic operations. Would be awesome if this
could also work vice-a-versa.

Thanks in advance for your help on this. I have absolutely no idea
how to write this kind of thing, please help! I've made my question
MUCH more concise so it should be clear now = )