So in other words, you just want to use a standardized legal template? Yes, you can do that. People have been doing that for decades. Pretty much every major l

So in other words, you just want to use a standardized legal template? Yes, you can do that. People have been doing that for decades. Pretty much every major lease or purchase agreement you or your parents have made in the past 4 or 5 decades has used a standardized legal template. Note that these templates have the variable fields in-line; if you want to do it as a separate document as proposed, you would need to do that as an attachment or exhibit to the original underlying contract. The former is generally required for contracts between businesses and individuals; the latter is uncommon but is used for B2B contracts. Generally, if there is a significant amount of conditional logic, you would need/want to split that out as a separate (possibly standardized) contract addressing those particular logical conditions. But note that plenty of standardized contracts have conditional blocks that affect the selection of a particular term of the contract (i.e., amount of monthly payment, points paid, choice of extended warranty, etc.).