Yes. It is quite common for indentures to be updated or rewritten when they are old or are lacking substance. The ease or difficulty of amending a subdivision's trust indenture depends on the procedures established in the documents themselves.
Some indentures allow amendment by a majority of property owners in the restricted subdivision. In other indentures, it may be necessary to obtain the approval of all property owners within the subdivision. A well-written indenture will usually have a clearly defined amendment provision. It is recommended that subdivision associations enlist the assistance of an attorney in creating or updating their indenture.
Since indentures are legal documents, attorneys have the necessary expertise to ensure a subdivision association drafts a properly structured and legally sound document.