Can an addin save variables or arrays to a workbook

[John]

I have an addin that when run, it sorts through a Master worksheet of items
we will be purchasing and creates two sets of new worksheets:

Set 1 - worksheets sorted by column MFG(manufacturer); this worksheet has
only items that have a similar value in column A in the master worksheet.
These are formatted as Purchase Orders

Set 2 - worksheets sorted by column Room #; this worksheet has only items
that have a similar value in column B in the Master worksheet

As it is parsing the information, it creates a new sheet tab for every
unique MFG, names the tab the same as the unique name, and then save that
name into a collection of MFG tab names.

Then it does the same for the rooms.

I do this so the user can display only MFG tabs, only Room tabs, or only the
Mastersheet(Hiding all others)

I would like to save these two collections with the workbook, so when it is
re-opened it will still have that information.

I have created two workbook names which get saved with the workbook:

JNum = 5421
JName = "MyJob"
MasterWorkBook.Names.Add Name:="JobNumber", RefersTo:=JNum
MasterWorkBook.Names.Add Name:="JobName", RefersTo:=JName

Is this the best way to do this? And is there a way to save arrays,
collection, UDT's, or classes???