If my client gave me 500,000 words to translate for next week, I might split it up into sections, known in the building and engineering trade, at least, as "work packages", and put an ad in the Jobs section asking people to tender for one or more of my "work packages".

In the building/engineering sector, work packages might be any of:
earthworks
drainage
sewer
electrical connections
water supply
structural work
roofing
cladding
internal joinery
external joinery
plumbing
floor coverings (sub packages: tiles, carpet, parquet, concrete in carparks, paint, etc.)
wall coverings (sub packages: tiles, wallpaper, fabric coverings, wood panelling, etc.)
lifts
escalators
etc. etc.

Some companies might tender for several packages, e.g. lifts and escalators, earthworks and drainage, internal and external joinery, roofing and cladding, etc.