The phrase "as a substantial part" is correct and usable in written English.
It can be used to indicate that a significant portion of something is being referred to or considered.
Example: "The report highlights that as a substantial part of the budget, marketing expenses have increased significantly this year."
Alternatives: "as a significant portion" or "as a major component".
US culture looks to the individual's access to the litigation process as a substantial part of the regulatory picture.
However, its findings proved something of a damp squib and failed to register as a substantial part of the debate around charter review.
Brody became the youngest ever winner of the Oscar for best actor, fending off the claims of Michael Caine, Daniel Day-Lewis, Jack Nitholson and Nicholas Cage; it was a particularly sweet success following the low point of a few years earlier, when what had started out as a substantial part in Terrence Malick's The Thin Red Line was virtually edited out of existence.
For all its right-wing political muscle, ALEC has long enjoyed tax-exempt status as a nonpartisan charity under section 501(c )(3) of the tax code, which is supposed to bar it from influencing legislation as a substantial part of its activities.
As a substantial part of those costs are fixed (Van Hemmen 2008), bankruptcy procedures are especially costly in the case of small firms.
As a substantial part of building envelopes, façades also play a predominant role in consolidated cities, for they impact thermal balance while also defining the outdoor space.
Paradoxes termed as Insolubilia form also a substantial part of logical and philosophical investigations during the Middle Ages.
As a result, a substantial part of the structure may collapse, causing greater damage to the structure than the initial impact.
As it represents a substantial part of the equatorial band where the ocean gains a large contribution of heat from the atmosphere, nuch attention has been given to various mechanisms involved in the maintenance of the cold tongue.
As research regarding uncertainty evaluation for energy models is not yet as advanced as for example in climate science, a substantial part of discussion is based on examples of other disciplines, especially climate science.
The results obtained from the approximate model are in good agreement with results from the general model, as well as with the experimental results, for a substantial part of the space, except for the periphery.
