Overlapping lines

Hi,

Nice job!! ;)

I'm trying to do a flowchart with 2 conditions but I can't place box where i need:

I obtain:

My code:
st=>start: Start|past
e=>end: End
op1=>operation: op1
text center|past
op2=>operation: op2|current
cond1=>condition: cond1|approved
cond2=>condition: cond2|approved
sub1=>subroutine: sub1|future

st(right)->op1(right)->cond1
cond1(no)->op2
cond2(no)->op2
cond1(yes, right)->cond2
cond2(yes, right)->sub1
op2(right)->sub1(right)->e

And I'd like to have this position:


is it possible to do it?

More over I'd like to center some text inside a box, is it possible too?

Thanks,
Best regards,