Learn Spanish (Latin America): Póngalo en la camilla como indique el triaje. - Put him on the stretcher as the triage indicates.

This is the core of manner clauses! We use the subjunctive (indique) because the specific instructions of the triage are either unknown to the speaker or haven't been issued yet. It means 'however the triage may indicate.' If the speaker were referring to a known, already-read instruction, they would use the indicative: como indica el triaje (exactly as the triage indicates).

Could I use según or conforme instead of como in this sentence?

Yes, absolutely. You could say según indique el triaje or conforme indique el triaje. In this context, all three words act as manner conjunctions meaning 'as,' 'according to how,' or 'depending on how,' and all of them trigger the subjunctive for unknown future actions.

Why is the pronoun lo attached to the end of Póngalo, and why does it need a written accent?

Ponga is the formal usted command for poner (to put). In Spanish, object pronouns like lo (him/it) must be attached directly to the end of affirmative commands. Adding lo creates a new, longer word. To keep the natural spoken stress on the original syllable (pon), a written accent is required: Póngalo.

Why does the subject el triaje come after the verb indique instead of before it?