Is there a way to integrate [target=focustarget] into a castsequence?

I'm positive this is a noob question, however, I'm at work and I can't test out my few thoughts.

I was thinking I could just use:

/castsequence [target=focustarget] [nomodifier] reset=target/combat Immolate, Corruption, ...ect

or

/assist focus
/castsequence [nomodifier] reset=target/combat ....ect

Any help would be appreciated, I'm still trying to figure out my layout for the new PvE group.