Question about 'sculpt spell'

How does the School of Evocation's Sculpt Spell feature work with spells that potentially deal ongoing damage? 

The description reads: 

When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell’s level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

What if the wizard casts Wall of Fire? Can they designate party members that can effectively walk through the wall of fire unscathed, round after round?

Not quite, because that's not how that spell works. There's a saving throw involved to avoid the initial damage caused when the wall appears, and Sculpt Spells can grant an automatic success on that. But on subsequent rounds, the wall deals fire damage to nearby creatures without a saving throw, and so Sculpt Spells technically doesn't apply.

That's really helpful, thank you.
If I encounter a spell that deals continued damage with saving throws, would those designated be immune?

What about a spell such as Storm of Radiance?

When the storm appears, each creature in it makes a Constitution saving throw, taking 2d10 Radiant damage and 2d10 Thunder damage on a failed save or half as much damage on a successful one. A creature also makes this save when it enters the spell’s area for the first time on a turn or ends its turn there. A creature makes this save only once per turn.

 Would designated PCs be immune to the damage throughout?

5.5e version: 

Level 6: Sculpt Spells

You can create pockets of relative safety within the effects of your evocations. When you cast an Evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 plus the spell’s level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

5e: 

Sculpt Spells

Beginning at 2nd level, you can create pockets of relative safety within the effects of your evocation spells. When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell’s level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

It's worded oddly.  The spell switches from "pockets" meaning an area to creatures.  I states the chosen creatures succeed on their "saving throws", not "saving throw" which implies multiple saving throws may be affected.  "Pockets" would be stationary so I suppose as long as you stayed in the same position you would benefit for as long as the spell lasts.  Moving around though, maybe not.  

Quote from RootlessCosmopolitan0101 >>

What about a spell such as Storm of Radiance?

When the storm appears, each creature in it makes a Constitution saving throw, taking 2d10 Radiant damage and 2d10 Thunder damage on a failed save or half as much damage on a successful one. A creature also makes this save when it enters the spell’s area for the first time on a turn or ends its turn there. A creature makes this save only once per turn.

 Would designated PCs be immune to the damage throughout?

Yes. Sculpt Spells affects all saving throws made against the spell, including both those that happen initially when the spell is cast and those that happen later on.

Quote from ArmorStorm >>

5.5e version: 

Level 6: Sculpt Spells

You can create pockets of relative safety within the effects of your evocations. When you cast an Evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 plus the spell’s level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

5e: 

Sculpt Spells

Beginning at 2nd level, you can create pockets of relative safety within the effects of your evocation spells. When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell’s level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save.

The spell creates "pockets" of safe areas in which the creatures receive the benefits of the spell.  If they move from those areas they would no longer benefit.

In my experience people generally consider that part of the description to be flavor, since the rest of it doesn't define how big those "pockets" are, where they can be, etc. I think the intent is that specific creatures are affected, not specific locations.

Thank you!

No problem!