How can I merge a numeric matrix (1 column) to an existing numeric matrix?

I have created a column numeric matrix like that

A={1
     2
     3
     ....} 

and I want to merge it to an existing matrix (B) at a specific cell (sc)

B= {
time    data
time    data
time    (sc) 1
time     
...         }.

so that i would look like this

B= {
time    data
time    data
time     1
time     2
...          3 }.

If anyone can help me I would really appreciate it. I'm new here and I do not know that mny functions

Answer 1

[dpb]

Presuming the B vector already exists to match the right size, simply knowing the row number is sufficient...

B(sc:end,2)=A;