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To get references to existing projects and contexts, you need to define a couple of functions which can be called like this:

Code:
tell application id "OFOC"
	set oDoc to default document
	set oProj to GetProject(oDoc, "project-A")
	set oContext to GetContext(oDoc, "context-A")
end tell

on GetContext(oDoc, strName)
	tell application id "OFOC"
		tell oDoc
			set lstContexts to flattened contexts where name = strName
			if length of lstContexts < 1 then return missing value
			return item 1 of lstContexts
		end tell
	end tell
end GetContext

on GetProject(oDoc, strName)
	tell application id "OFOC"
		tell oDoc
			set lstProjects to flattened projects where name = strName
			if length of lstProjects < 1 then return missing value
			return item 1 of lstProjects
		end tell
	end tell
end GetProject
Then using DevonThink's supplied code, you should be able to make an edit like the following:

Code:
-- Script to add a selected record to OmniFocus as a to do
-- Written by Eric Böhnisch-Volkmann, Version 1.0.2, Aug 10, 2010
-- © 2010 DEVONtechnologies, LLC


-- Set properties
property pDaysIntoFuture : -1 -- Created to do will have a due date n days in the future
property pPrefix : "Reminder" -- Prefix for the created to do item
property pDelays : {{displayname:"No due date", value:-1}, {displayname:"Tomorrow", value:1 * days}, {displayname:"In two days", value:2 * days}, {displayname:"In three days", value:3 * days}, {displayname:"In one week", value:1 * weeks}, {displayname:"In two weeks", value:2 * weeks}, {displayname:"In one month", value:4 * weeks}, {displayname:"In two months", value:8 * weeks}, {displayname:"In three months", value:90 * days}, {displayname:"In six months", value:180 * days}, {displayname:"In one year", value:365 * days}}
property pDefaultDelay : "In one week"

on GetContext(oDoc, strName)
	tell application id "OFOC"
		tell oDoc
			set lstContexts to flattened contexts where name = strName
			if length of lstContexts < 1 then return missing value
			return item 1 of lstContexts
		end tell
	end tell
end GetContext

on GetProject(oDoc, strName)
	tell application id "OFOC"
		tell oDoc
			set lstProjects to flattened projects where name = strName
			if length of lstProjects < 1 then return missing value
			return item 1 of lstProjects
		end tell
	end tell
end GetProject

on run
	-- Import helper library
	tell application "Finder" to set pathToAdditions to ((path to application id "com.devon-technologies.thinkpro2" as string) & "Contents:Resources:Template Script Additions.scpt") as alias
	set helperLibrary to load script pathToAdditions
	
	try
		-- Get the selection
		tell application id "com.devon-technologies.thinkpro2" to set thisSelection to the selection
		
		-- Error handling
		if thisSelection is {} then error localized string "Please select a document or group, then try again."
		if (length of thisSelection) > 1 then error localized string "Please select only one document or group, then try again."
		
		-- Get and format the data we need
		set pLocalizedPrefix to localized string pPrefix
		tell application id "com.devon-technologies.thinkpro2"
			set thisItem to first item of thisSelection
			set theSummary to (pLocalizedPrefix & ": " & name of thisItem) as string
			set theURL to (reference URL of thisItem) as string
		end tell
		
		-- Let the user choose when to receive the reminder
		-- Convert array into localized arrays
		set pLocalizedDelays to {}
		set pLocalizedDelayNames to {}
		repeat with theDelay in pDelays
			set pLocalizedDelays to pLocalizedDelays & {{displayname:localized string (displayname of theDelay), value:(value of theDelay)}}
			set pLocalizedDelayNames to pLocalizedDelayNames & {localized string (displayname of theDelay)}
		end repeat
		set theChoice to choose from list pLocalizedDelayNames with title (localized string "Set reminder") with prompt (localized string "Please choose when you want to get reminded of the item") & " \"" & theSummary & "\"" & (localized string "%choice prompt end%") & ":" default items {pDefaultDelay}
		if theChoice is false then return false -- If the user pressed Cancel, exit
		set theDelayValue to pDaysIntoFuture -- Assume default
		try
			-- Find the number of days associated with the user's choice
			repeat with theDelay in pLocalizedDelays
				if ((displayname of theDelay) as string) is equal to (theChoice as string) then set theDelayValue to (value of theDelay)
			end repeat
		end try
		
		-- Calculate due date
		if theDelayValue ≥ 0 then set theDueDate to (date (date string of (current date))) + theDelayValue
		
		-- Add new to do to named project
		try
			tell application "OmniFocus"
				set oDoc to default document
				
				set oProj to my GetProject(oDoc, "project-A")
				set oContext to my GetContext(oDoc, "context-A")
				set recProjContext to {project:oProj, context:oContext} as record
				
				tell oProj
					if theDelayValue ≥ 0 then
						set newTask to make new task at end of tasks with properties {name:theSummary, due date:theDueDate, note:theURL}
					else
						set newTask to make new task at end of tasks with properties {name:theSummary, note:theURL}
					end if
				end tell
				set context of newTask to oContext
				
			end tell
		on error errmsg
			display alert (localized string "OmniFocus is not available.")
		end try
		
	on error errmsg
		
		display alert (localized string "Error when adding item to OmniFocus") message errmsg
		
	end try
end run