Linking a few Crystal Reports

Question

Hello,
Let me start by apologizing in advance because I am not as technical as most of you that will likely respond.  I am working for a company that has partnered with BOBJ and I am trying to develop a report internally, but we do not have any Crystal Reports experts in-house.  Here is the background info:
I am using Crystal Reports XI R2 (SP3) and I am accessing the report data from a Universal Web Services Connection (UWSC).  Basically, our company pushes reports to a server (in what appears to be a flat .CSV file) and my Crystal Reports designer accesses this data via the USWC after authenticating login credentials for the server.  I have four data tables stored on the server, each with ~8,100 records.
Here is what I am trying to do:
I am trying to consolidate the four data tables into one Crystal Report, but I think I am linking the data tables incorrectly.  The report would be structured to show all metrics and calculated values (via formulas) for 900 projects grouped by the 9 established date periods.  These are my four data tables, with their associated columns, on the server:
1. 
Date
Project name
Project ID
Sales Rep
Sales $ (Forecast)
Sales $ (Actual)
Sales $ (Variance)
2.
Date
Project Name
Project ID
Project Manager
3.
Date
Project Name
Project ID
Cost $
4.
Date
Project Name
Project ID
Revenue $
So, as I said, I am trying to link these reports into one comprehensive Crystal Report that may contain formulas that span across each data table.  Each table has about 900 projects where each project's values are reported for each of 9 date periods (there are only 9 possible values in the date column), which gives me my ~8,100 records in each table.  Think of this as a pivot-table file where each of the 900 projects (and Project IDs) will appear 9 times in each table for each of the 9 established date periods.  I tried linking the values Date and Project ID in my Database Expert to the corresponding Date and Project ID columns in report #1 and then grouping the Crystal report by Date from report #1, but I received a database connection error and reading records seemed to take about 3 seconds per record.
If anyone can provide some insight here I would greatly appreciate it.  Please be as specific as possible because I have tried a few options and cannot seem to get exactly where I need to be.
Thanks in advance for any responses.

Answer 1

@sharon towler: Sorry, I must have not been clear about the end result of my report, so your reply is not specific enough and doesn't seem to get me to the solution that I desire in my report output.
@Brian Dong:
It's a report that would list the records pretty basically with some formula use (addition of fields between reports).  The report might apear as below with each column header separated by "|"  and the formuals written in the column headers:
(Group Header)
Date
(Details)
Project name | Sales Rep | Sales $ (Forecast) | Sales $ (Actual) | Sales $ (Variance) | Project Manager | Cost $ | Revenue $ | Sales $ (Actual) minus Cost $ | Revenue $ minus Cost $
In this report, the table listed as #1 in my first post would be the "1 driving or main table" and all the other tables (#2,3 & 4) will supply the supplimental data for each record (table #1).
As for my criteria for a record, I would say that technically, in this Crystal report it is determined by the unique Project ID AND the Date (my Key Fields).  More specifically, each project, with its unique Project ID, will appear 9 times in each of my 4 tables for the 9 different date periods, so my records are really determined by the unique Project ID AND the unique Date.  In all cases, the Project ID and Date are the same field types in the 4 tables.  Here is a simplified example using date input in only table #1 & 2:
1.
Date   | Project Name      | Project ID | Sales Rep | Sales $ (Forecast) | Sales $ (Actual) | Sales $ (Var)
9/1/08 | Deployment Test |   5           | Jim Smith  | $100                     | $75                   | $25
8/1/08 | Deployment Test |   5           | Jim Smith  | $120                     | $50                   | $75
9/1/08 | Testing Website  |   34         | John Doen  | $200                    | $50                    | $150
8/1/08 | Testing Website  |   34         | John Doen  | $400                    | $125                  | $275
2.
Date | Project Name | Project ID | Project Manager
9/1/08 | Deployment Test |   5           | Bob Jones
8/1/08 | Deployment Test |   5           | Bob Jones
9/1/08 | Testing Website  |   34         | Bill Carr 
8/1/08 | Testing Website  |   34         | Bill Carr
In this case, you can see the Projects with IDs 5 and 34 appear in both of the two tables.  In my final Crystal report I would just want to display the Project Manager from table #2 above as another column alongside all the other metrcis in the "main table" in table #1 above when the Project ID and Date match.  The trial and error method is not exaclty working for me vert well because any field that I add to my report causes the database connection error. 
I hope I didn't complicate things even more and please let me know if you have any more advise now that I have provided some specifics.